You will see different things in a profile depending on whether you are looking at your own profile or that of another user. The total number of events you have participated in and the date of your most recent one are visible to everyone.
Another person's profile
For yourself, you can customise your Discord notifications and integrate external calendars.

Reminders

Calendar sync

 You can also enter your Steam ID. Currently, this is only used for communicating with external systems, but don’t worry — there’s more to come!