Is there a way to invite a predefined group of attendances

Hi @morann! I suggest creating either a group chat or a chat channel via Zoom Team Chat and add the people you'd like to attend the non-planned meetings.  Once the group chat or channel has been created, you'll see a meeting button at the top right portion of the app, which lets you easily invite all chat members into the meeting:

For more information, check out Getting started with Zoom Team Chat. I also recommend you to enable and use Continuous Meeting Chat to keep all chats shared during, before, and after the meetings.

thanks, sounds like a valid solution, only problem is that I dont have team chat in my zoom app or at the web portal settings, maybe it was hidden by our admin, not sure