If it's Puyallup, have there be a steady "snowfall" of ash from Mt. Rainier. Have there be lots of ash build-up in the street, with tracks and ash/snow-angels and the like.
Toy with visibility accordingly. Also, Puyallup can be windy as hell in real life. More modifiers there, plus shifting snowdrifts of ash. Maybe even break out some of the "Killing Frost" rules from Run & Gun to encourage them to dress properly. Gas masks or filtration systems highly recommended.
Maybe add a clause (Claus) that they need to retrieve the weapons from the kids, but they can't hurt the kids. The kids will be shooting at them (because Puyallup) but the runners can't shoot back. The kids are rotten shots, granted, but it should amp up the tension for the players. Maybe the elves can talk the kids down, or bargain with them for something more appropriate. What if one of the kids develops a crush on the Elf Technomancer Sniper Paracritter Hunter and doggedly follows her around?
Wireless access is spotty in Puyallup, which should drive the TM bonkers. I used to apply negative modifiers to TMs for all actions (à la background count, rebranded as Noise) when they were in Puyallup, but that could be harsh for a new player.
I like the toxic Santa idea. Seems like a good foundation for an adventure, and it introduces new players to concept that the Sixth World is not a benevolent place.