Admission prices vary by location. Some of the multi-day events include a Tea Party, musical performances, and (of course) a visit by Santa.
Check out their websites below.
Idaho Falls, Nov 14 - 18, 2022: https://www.dwinc.org/festival-of-trees/
Pocatello, Nov 16 - 19, 2022: https://www.isu.edu/cob/festival/
Rigby, Nov 29 - Dec 03, 2022: https://www.facebook.com/RigbyFestivalOfTrees/
Blackfoot, Nov 30 - Dec 3, 2022: https://christmastreefantasy.com/
Look in your local communities for more craft fairs, light parades and other Christmas events. Many are free and can help brighten your spirits at this holiday time.