Q u o t e: I don't know I think those kinds of things can be fun, but maybe as more specific bonuses for celebrations. I think it would be cooler though if for like, say an anniversary weekend, monsters are tougher or drop better loot or something. Sounds cool to me, no plans I'm aware of that would support such functionality but you never know.
I think it's fun to have a reason to log in maybe even if you haven't played in a while. It's a good way to keep interest up without having to patch in new content or something.
Not sure why people would be against some variety in a game.
I think this would be a great idea. An example would be to have a week long event at the beginning of each month that gives you bonus chance of dropping ruby (a specific type) gems and have the gem type change every month. Or have a Halloween event were the number of spawned champions are increased. The possibilities are endless for keeping things interesting.