I'm assuming that advising you "just go on working" won't have much effect. The best compromise might be to try and find short, low-attention jobs that you can do around meeting time so you can instantly break off when you're called to the meeting and it won't matter if your mind isn't totally on the job.

These might be mundane administrative or housekeeping tasks (anything from cleaning your desk to sorting your email inbox or deleting unused files and documents), or other one-off tasks (conducting online research, interactions with nearby people, putting things in nearby places). If you can't easily think of these jobs, you could make a to-do list of such tasks in whatever format is quickest and easiest to access, and either tick them off as you do them, or if you don't have time after each task, revisit it in an idle moment and update the to-do list.

An alternative would be just to slack off around meeting time and search the web or play with your phone or chat with neighbors till you're called. If you're not going to get any work done, you may as well not try.

Don't pay attention on all this meetings times at all. Since even management is so unprofessional, that they don't care, why should you?

Concentrate on your stuff and only when meeting actually comes, you come in.

... what can I do from my side to cope with this problem. How [can I] continue working normally?

As your manager said, "Don't think about it, just continue working."

Are there any tricks to concentrate and ignore this standby situation?

Yes.

1. Know by experience that this type of meeting is fluid, rather than in stone.


2. Know that it has nothing to do with you.


3. Make notes (questions/comments/suggestions) in your phone.


4. You don't have to worry about forgetting them, because... #3


5. There is no pressure because nothing you say (no question or comment) will change the outcome, because...


6. The outcome is already decided. The big boss is just announcing it.

Nothing from you should indicate that "the big boss" is wasting your time.

Those are what I'd call "career limiting".

You've already mentioned this to your boss, which is fine.

But, don't mention it to your boss again - once is more than enough, since they're already aware.

One more piece of advice: If the big boss asks for questions/comments/suggestions, limit yourself to either zero or one. Especially zero (see #6 above).

It may or may not be applicable in this particular case, but I've found it a lot less stressful to work for an indeterminate time if I know I'll be able to take a minute or so to ‘park’ the work before going off to something else.

Especially if it's a task that involves a lot of thought, or juggling a lot of mental state, knowing I can spend a minute ‘dumping’ that to a piece of paper or text file lets me be much more productive and relaxed.

Of course, that's not always possible.  But in my experience, if a meeting is at an indeterminate time or has been delayed, people are generally more tolerant and don't expect you to drop everything instantly.

(Conversely, one of the most frustrating jobs I had was one where interruptions averaged every 10 minutes, and people expected me to drop everything and instantly be not only listening to them, but also remembering exactly what they were talking about…  This cartoon explains better than I can just how frustrating that can be!)

Just filter out the time from the message.

In fact you might as well filter out the complete message, since in your workplace "we have a meeting at 14:30" seems to mean "we may or may not have a meeting sometime today/this week/next year."

When you do finally get called to the meeting, don't feel bad about taking as long as you need to "close down" what you are doing to a state you can recover from.

If the meeting organizer complains that you are "late" for a meeting which actually started an hour late, simply reply "sorry, but your inability to organize your work schedule is not my problem."

Final piece of advice: never set an alarm to remind you about things that might not happen on time.

In general: Write your thoughts and questions down.

(With respect to the upcoming meeting topic, of course.)

• What are your ideas?


• What problems and potential pitfalls do you see?


• What questions could be properly addressed to you?


• What questions do you anticipate (addressed to you others) that you could answer???


• Depending on your role, is there a quick visual (diagram, design, other other imagery) you could sketch up quickly to contribute?

In this particular case, you "kept repeating in [your] mind what [you] would say about [your] projects." So, start by writing down what you're mind already has on repeat. Do this quickly, and make a second pass to flesh out details or prepare for questions you might be asked.

Etc.

This is a really good habit to get into, in my opinion, regardless of whether you have meeting anxiety (or ... we'll just say, flexible meeting start times). One of two things will happen, and often both in my experience:

• You'll be well-prepared for the meeting. You'll look and sound professional and confident. And, you'll impress the shit out of everyone.


• Your anxiety will fade, and you might actually find that after a few minutes of note-taking, your mind has stopped racing and can focus on your assigned work again.

This sort of thing really helped me personally. And at this point, if I know I've got a meeting coming up and I'm already well-versed in the topic — there's not much anxiety. If it's a new topic, I'm likely to take my mind out of that endless thought-cycle by writing my thoughts and questions down 15 to 30 minutes ahead of time. And then I feel OK.

If I was told there was a meeting about to start shortly, then I would probably do some small tasks until the time the meeting is supposed to start. If there is still no meeting going on, then I would continue with small tasks until ten minutes pass by. Once it is ten minutes after the meeting was supposed to begin, I would probably start working on major task items until I am preempted by the team lead, manager, co-worker, etc. that the meeting is actually about to begin.

The meeting is delayed? Just don’t work then.

Look, you are en employee for a company. While interacting with co-workers requires human interaction, I have news for you…

These are not really “human” interactions. These are business interactions.

In your case, your business task is to do work at your workstation until you have to do something else. Like be in a meeting.

If your boss tells you a meeting is happening at 14:30, then guess what? Stop working. Regardless of what is happening, just stop working.

The deal is you are not responsible for scheduling and delays; they are.

If you are being told to be ready for a meeting at a specific time, just stop what you are doing and that’s it.

Believe it or not, waiting for meetings is a part of the job as well. So just don’t worry about it.

Most of the other answers doesn't take into account the update OP gave in their post, so I thought I'd throw in my 5c:

The problem: I cannot work normally when I know I will be interrupted any minute.
How to continue working normally?
Are there any tricks to concentrate and ignore this situation?

That problem is unsolvable. You are a human being. By definition, if you are aware that you can be interrupted with high-priority stuff any minute, you won't be able to work normally. Being aware of a possible interruption raises your adrenaline and/or vasopressin levels, depending on the exact setting.

You will be able to work normally as soon as you forget about the possible interruption, by doing something intellectually or emotionally engaging - but you will still be extremely annoyed by it when the interruption finally happens, and won't be able to work normally for some time after that, due to a sudden drop in adrenaline and vasopressin but also highly evelated cortisol level.

As long as you're a sentient human being and are not using hospital-grade drugs blocking the secretion and/or uptake/reuptake of hormones, there is no real trick here. You're being put in a stressful situation, and you're showing a normal reaction to stress.

This is actually a sign of both mental health and emotional sensitivity. If you really want, you can try to fight with it. I, personally, wouldn't. No job is worth getting numb and empty inside, IMVHO.

How to (...) not waste time waiting?

How to be productive while waiting for meetings to start?

This meeting was about our team performance and our salary raises depending on that. I couldn't stay careless as I kept repeating in my mind what I would say about my projects.

If you really want/need to be productive then, do things that are extremely low-priority and don't require any intellectual or emotional immersion (like mentioned by other people). I would look at other people in my team do, though - if they are slacking off while waiting, I'd also find e.g. a good online game to play or a nice video stream to watch :)

The real problem lies elsewhere, I think.

I talked with my managers, they don't get me seriously and say "Don't think about it, just continue working". They are not willing to change this process, while the only thing I want is to be informed what's going on (Do I have to wait 5 mins or 1 hour for example)

What you did was professional. What they did was unprofessional. There's no professional way to deal with people who behave unprofessionally, by definition, other than either not giving a flying -d-uck, or switching to another workplace. If a meeting (...) about our team performance and our salary raises is treated like that, it's basically like the top brass is saying "we don't give a flying -d-uck about your salaries, your time, your well-being or you at all" in your face - either you allow it for some reason and ignore it completely - or you don't, and look for other place to work.

Being treated like that should light a red light saying STOP in your head.

Also, concerning something I read in one comment here:

Do you plan to work longer at such a company, or is that a way to get fired?

Actually, that's a good point - if you want to continue work in a place when you will be treated like garbage, for any reason (e.g. a very urgent need for money, not being able to switch etc.) raising any concerns is not a good idea.

A meeting with your bosses boss is not when it's "time", it's when the bosses boss has time.

chuckle Nope. A meeting with my bosses boss is when we both have time. I'm not a slave - I'm a valued specialist in a highly competitive market. If my bosses' boss would treat me like OP was treated repeatedly, he would get my notice, as simple as that - and I would essentially expect the same from him. I'm not doing him a favour by working for him, and he's not doing any particular favour for me. We're exchanging my work for his money, and I don't recall anything about "slavery" or "obligatory loss of self-respect" in any contract I had signed :) If he wants me to wait - so be it, I'm still getting paid. If, however, he do[es]n't get me seriously when the subject is our team performance and our salary raises depending on that, then it's high time to update my CV again and browse some nice brand new job offers :)

Productive, that's possible! Just find an activity with the following property:

• leaves you in a state of mind very conducive to meetings right after

Some options:

• read a novel


• meditate


• do a Sudoku


• doodle


• eat a light sandwich

And that's it.

I'm afraid work productivity is not a true possibility, because your manager is explicitly wasting your time. That doesn't mean you can't do something productive for you as a human being, but it will at best have second-order positive effects on your work performance.

More office-styled alternatives are perhaps:

• read lore related to your work, e.g. history of a technology


• play with the product you're making


• urinate


• organize documents


• sleep under your desk

Good luck!