November 30: First Sunday of Advent
December 5: St. Nicholas Eve (very important that St. Nicholas not go to bed without remembering to do a few things first)
December 6: St. Nicholas Day
December 8: Immaculate Conception (Holy Day!)
December 12: Our Lady of Guadalupe
December 13: St. Lucia
December 17: O Antiphons begin
If you haven't observed all of these things in the past, do not -- I repeat, do not -- feel pressure to do it all. No one does it all.
You might want to pick one or two new things on which to focus -- and then, have fun with them. These observances are meant to deepen our faith and draw us closer to God. Getting stressed out about how well we do this stuff, or about whether we do it at all, doesn't deepen our faith; it just irritates us.
God doesn't want us to get irritated in preparation for His Son. That would sort of defeat the purpose of the Prince of Peace, wouldn't it? Peaceful and meaningful preparation is key. No panic necessary ... just keep your eyes fixed on the Prince of Peace.