There are plenty of months in the year that have no "special events" occurring. It would be fun if they would just switch on a past event for random weekends. Dragon quest weekend, FFXIII weekend, FFXI weekend, etc. Put them on a rotating schedule, and add a new event occasionally. The current Rhapsody fates are pretty good, as were the dragon quest, Shantotto, and Lightning fates. I wouldn't mind doing them again if I was in the area leveling a character, and mixing up the fates in a zone (as long as it doesn't affect quests and relic farming) is always welcome.

And for anyone who wants NEW events... it doesn't have to be one or the other. All the old promotional events are already in the game. There is absolutely no reason they couldn't flip on the lightning event as soon as the Rhapsody event ends.