Yess outdoor locations sounds perfect! There could be all these lanterns/decorations/pumpkins and such extending to the different outside areas and some of the paths for the celebration, people get quests to travel to some open areas around the map to help decorate (it's definitely not a creepy ritual site relax!!) or stronger characters tasked to help bring others along in the evenings for anyone worried of traveling alone, etc etc.
Both works as far as the intent imo - people's inherent energy being the primary goal suits the setting, but some creatures could be more outright attack upon encounter types :>b