Best practices for this project

I have a school that I am working with to create a 'Class Reunion' site.
The school has a little over 55 graduating classes so far.
Each class will have it's own reunion and reunion events.
Each reunion will have specific people who are part of that class.
I started by creating 'categories for each classes. ie 1966, 1968, 1969, etc
I know I can then add that category to the event.
This isn't really a 'membership' site, since they are only registering for the events.
Are there any other similar sites using the software, and can I get a link to them?
I want to avoid any major missteps that are 'known'.
Thanks in advance.

Are there no sites similar to this using this app?
An answer would not only be nice, but appropriate.

I haven't worked on any that are set up for an event (or events) like that.

If you're wanting to have each grad class as its own category so that all events for that class can be grouped together, then it sounds like your taking the approach that I would take in your setup.