How to add content to Calendar

Srinivasa Raghupatruni

I created a calendar and want to add notes on a specific day like birthday etc

Victor Florin Pana

I assume you are referring to Confluence Calendars and if this is the case, have you looked over the documentation of the add-on? 

https://confluence.atlassian.com/teamcal/add-events-241566251.html