I bought tickets for Rams Head before Edison Lot was added for the 2022 event. Now some of the bands I wanted to see at Rams Head are playing at Edison Lot, so what should I do?

You don't need to do anything, as all Rams Head tickets that were sold before the addition of Edison Lot now give you access to both Rams Head AND Edison Lot. In other words, you have access to both venues and more bands than originally expected.