Allow a user to set their default reminder, such as "I want to by default be reminded an hour before events."
When signing up for an event that allows reminders, Sesh will DM the user (if they set a default) with a message saying "Per your default settings, you will be reminded 1 hour before this event starts. Would you like to receive a reminder at a different time for this event?" - Reactions for Yes and Remove Reminder.
If the user doesn't want to change the reminder for the event, no interaction is needed.