Event reminders can help you keep up to date with the important occasions in your life. Reminders can be set either for an individual event, or as a global default, so that all events on your calendar will have notifications shown in the same way.
Set default event reminders
If you know that you want to be reminded of most events in the same way each time, you can set a global default by going to Settings → Preferences and scrolling to the Calendars section.
You can click Add reminder to choose default notifications for timed events or events that go all day. Choose Show an alert to see notifications displayed in your browser (provided you have Fastmail open in a tab at the time). Choose Email me to receive notifications via email.
Set reminders per event
When creating a new event in a calendar, the default event reminder (if one exists) is set up automatically, but you can change it if you want to.
You can receive notifications by email, in the browser, or on the app. To show the reminders in the browser and app, go to the Settings → Notifications screen and click the Calendar alerts checkbox.