Are you tired of holiday shopping yet?
Raise a Festivus pole.
Air your grievances.
Display feats of strength. (Read: pin your host to the floor... because Festivus isn't over until the host goes down!)
My feat of strength was a 4 mile run. It might not be a traditional Festivus feat, but it's in keeping with the spirit of the holiday.
Did you participate in any feats of strength to celebrate Festivus?