I recently saw this in global chat. The other GM actually did some hide n seek events.
Players then decided because they weren't winning them, to complain, and call the GM unfair, etc.
That's a prime example of why GM's and others are hesitant to kick off events like this.
Not all players are bad, don't get me wrong.
But without some specific suggestions with rules/guidelines, rewards, and some time for planning, it makes it difficult to brainstorm an "event" when GM's and others are far more focused on other creative tasks and maintenance.
I suggest this.
1. Post the name of the event in the thread
2. Post the rules of the event
3. Post the location(s) the suggested event needs to take place
4. Post rules to the reward system (1st place, 2nd place, or, if there is only 1 winner per event)
5. Post reasonable rewards for the winners
6. Suggest a time of day, and a week.
GM's will be far more receptive if you give it structure and creative input!