Do all changes on master branch. Publish the master branch. When major changes happen - mostly like when the event has ended tag it. Also tag it when updates are all done for the annoucements. So most probably you will have two tags a year. Let's see.
Sept 12, 2018 - Computer History Museum, Mountain View - https://awscommunityday.com/, also https://medium.com/@john.varghese/the-second-annual-aws-community-day-is-coming-to-the-bay-area-on-september-12-31f41aa271b1 June 15, 2018 - https://alestic.com/2017/05/aws-community-day-san-francisco/