The Bombastic Brilliance of Black Twitter

In addition to promoting events happening on your day of action, you can use your calendar to promote public appearances and other times your campaign will be promoted, even t.v., radio, and podcast interviews.

It can be a good practice to accept RSVPs even for events that don't require it. This gives you another touch point to gather supporter contact information and will allow you to follow up with people after the event occurs. Equally important, especially for public events, you can keep track of who actually attended the event (often a subset of the RSVPs), by checking people in at Event settings > Attendees.