Idk man I feel like we have so many mini competitions already..I know this is kind of hitting two birds with one stone rather than what you're saying but perhaps we could have the events more "themed"? So like if it's Labor Day or something then we have work-themed competitions or if it's Saint Patrick's Day, etc. The only issue with that is that there's lots of different cultures here in Pokémmo so we're just appealing to one audience.
Anyways, I think making totally new events is way to much work for such a small time period basically, so we can just "theme" the events we have going on now (see: Pokemmo Offical Events Forum)