I think you should do a simple search for Portals and understand how to create table relationships.
You will by default only see that users meetings in the portal when you are on that users record. This will limit display. Controlling actual user record access can get complicated, but you can do a decent job limiting the Menus and with scripting.
The portal will auto create the relationship. I am attaching an example file. The file is used for creating notes for people. You can easily replace notes with meetings. As you can each user/client sees only their notes based on the relationship.
NoteSample.fmp12.zip 79.5 K
If more than one User can attend the same meeting then you'll have to look into a join table, e.g. "Attendance", that will link users to meetings.
Downloaded and reviewed. I've already created something like this already with a table of Users and a Table of Meetings. Only one User will be at each meeting. A portal to show matching results.
What I need though is while on one User, how do I trigger creating a new Meeting with an auto-filled field for User that is THAT User.
Eg. I am in User_1 record that shows all Meetings that user has had. User_1 has a new meeting and clicks a button to add the Meeting details. I need the new Meeting to auto-populate that User_1 ID so it will automatically show up in User_1 portal.
I am eventually bringing this online with php so the users and the linked creation record may be a php thing. I am still learning on that front, but trying to design as much offline as I can.