Reminders can be set globally for all posts on your timeline, by groups, or for each individual post.
Global Default Reminders: allows you to set reminders for all posts on your timeline. This includes posts to any groups you are a part of, any campus-wide events that you have added to your timeline from the Events of Interest and any personal events or deadlines you have added manually. Once you set these options, they are applied to all posts currently on your timeline and any new posts that are published.
Tagged Posts: set a default reminder for all events that you added to your timeline from the campus-wide events list.
Group Reminders - Membership: these are the groups you cannot opt out of based on who you are at Princeton. You can set unique reminders for each group by clicking the icons on the right.
Group Reminders - Non-Membership: these are the groups you can choose to join or leave. From the Selected Groups tab, you can set unique reminders for each group by clicking the icons on the right.