Need help scripting potential new game mode

Hey all I am making a multi stage stronghold game type where the three capture points move once the new round begins (or ends), and was thinking three rounds in total would be best for the way I’ve designed the map. My issue is that I can’t seem to find anything in the node browser to plug in the round start/ round end part of the script. Any info would be much appreciated. I wasn’t sure as to if I should be using round start or round end and also unsure as to where I would plug in the round number value.