Some invitations arrive with a time and a title but no explanation. You are left guessing whether you are meant to listen, decide or present something. Many people accept anyway and hope that it becomes clear on the day. Often it does not, and the meeting drifts for a while before anyone finds a direction. That is a poor use of everybody's attention.
A short question to the person who sent the invitation can put this right. Ask what the meeting is meant to achieve and what is expected of you. Keep the tone friendly and curious, not critical. Most organisers are happy to explain, and some realise that the invitation was too vague. A reply of a few lines is usually enough.
Asking in a helpful way
The best moment to ask is soon after the invitation arrives, while there is still time to prepare. Write your question so that it can be answered in one or two sentences. For example, ask whether a decision is needed or whether news is simply being shared. This kind of question helps the organiser as much as it helps you.
Once you know the purpose, you can decide how to prepare. You may find that a short note from you would do, and that you need not attend at all. Or you may learn that you are expected to bring a particular piece of information. Either way, you avoid arriving with the wrong expectations. Time is saved on both sides.
If the organiser is unsure of the purpose as well, that is useful to know. It is better to hear that before the meeting than to discover it halfway through. Together you can decide whether the meeting is needed or whether a message would do. Sometimes a short conversation replaces a much longer meeting. Nobody loses anything by asking.
Over time, this habit changes how invitations are written in a group. People start to state the purpose in the first line, because they know somebody will ask. Meetings become shorter and more focused as a result. Colleagues also learn that a question is a sign of care, not of resistance. One brief message can improve the whole working atmosphere.