The finale will come when the invisible meter reaches 100 and will last 25 to 30 seconds and go back to the regular "one at a time" mode. There are different themed sprite backdrops for the different holidays. There is also a backdrop for Hanukkah (I don't celebrate It) but I know some people do, so if that's you, you will be asked if you would like It on that date. Just say yes if you do. If not, then say no. If you play for 5-15 minutes, you will get the VIP backdrop. The playtime may not mean anything. If the backdrop switches when your playtime reaches a milestone, great! Else, oh well. In case you didn't know, there is a finale warning sound. A deep rumble. It signals the start of the finale. So keep your ears in tuned for the sound.
Thanks to "ThunderingLions" for the original project.