For any event that occurs on a regular basis following some pattern, you can add a "recurring calendar event" to your organizations Tendenci calendar.

This is located on your Tendenci site at the link below. Access requires proper permissions of course.
/en/calendarevents/calendareventrecurrences/add2.asp

Examples of this would be Sunday Services for a church, monthly board meetings for an organization, or an annual event like an anniversary.

A couple of other thoughts on recurring calendar events. To "register" for an event that instance, meaning that particular time the recurring event occurs, must be converted into a "real" calendar event. This is so you can enable people to register or have that one board meeting near Christmas at a particular restaurant and RSVP without having to add each one individually.

To convert an instance of a calendar event, look at at instance of that event by clicking it on the calendar from /en/cev/. If you are logged in and have edit rights, and at the top of the event you will see text that reads:

"Want to allow registration? convert it to a regular calendar event"

You can't go back. Meaning once you convert an instance of an event it must remain converted although certainly you could turn off registration.