A few thought.

1) How about a random festival weekend. Throw a dart at a festival board and run that festival for the weekend.

2) Hobbit gamble weekend. Run the Taste of Hobbiton part of the festival but allow us to bet gold on the race with odds of winning.

3) TTHTI weekend. Set some sort of timer that spawns a random NRP hobbit and starts in Bree town and ends at the steps on Isengard. We have to take that NPC to Isengard and the top 10 times on each server get some sort of prize. Then mix it up sometime and take the hobbit to some other Iconic location.

4) Fishing weekend. In certain area put a chance to get rare items while fishing over the weekend.

5) PvP weekend. Double the amount of Commendations earned over the weekend.