No one* really cares about the Solstice. It's just... an astronomical thing. Proof of God's perfect clockwork of the universe. Not something special in and of itself. Not sacred.
*Correction: the Eyes care about the Solstice. It's one of the better nights for catching proselyting. This is why she planned to go by herself, and didn't go to anything bigger.
She had plans, anyway. She'd go to the park-- That Park-- again, with a bottle of cooking wine and some clearance cookies, and the knowledge she has no clue how to do a ritual (Hopefully an ignorant offering is still accepted.)
...and it appears that even just intending to counted for something? This. This is not Gilead. Or Cascadia, unless Cascadia decided to suddenly stop speaking English.
Half of her is irritated by how every single house has something out-- streets don't get coordinated unless little old ladies are going around putting the heavy on people about Insufficient Christmas Cheer[tm]. (Rock on, single fairy light guy. Stay strong, keep the faith.) Though she will forgive them a lot for the complete lack of Santa. There is not a single gaudy bishop punching bishop carrying a sack. No reindeer are sending messages that it's okay to be different, but not too different. And zero panopticon elves! Truly, it is a solstice miracle.
The Moon probably has her reasons for this, and she should probably get the lay of the land and try and suss out what it might be. She... probably has no local currency, and the teenager's club seems the place least likely to care about that. ('What's up, my fellow teens? I have definitely lived here my whole life and know what is going on. Snowflakes!')