Yes, I change to Winter, then put the sock on the fireplace and go to sleep. Normally, it will
trigger Santa event but no, it goes to next morning.
You don't go to sleep, you have to go to the TV room at night.
And there are new scenes, you have to talk to Rori to start 2 new quests (lemonade stand and treehouse), and to open the option of bathtub sex. Also, when Rori is in 2F Bathroom, you can peep through the loft hole, does not work for the other sister (shows empty bathtub). I also think there are more scenes you can trigger from talking with Rori (blowjob, normal sex, sleep together that can go into sex or just grinding)
I also got a robber scene when going to the tv room at night, no sex scene, just drops her sack with cash.