As per popular request, I've set up a forum for competitions!
I think some users are interested in running competitions, so I'll leave it to whoever is interested. I'd recommend, however:
- a regular monthly competition, so people know when the next one is and can plan for it (e.g. get some team mates together)
- a "token" prize - doesn't have to be anything serious, maybe just a picture of a badge
- "just for fun" informal atmosphere - just for some game making fun, not the kind of thing where it's worth getting upset over results or anything.
As I said, I suppose you can arrange everything yourselves - maybe the winner of the last competition could choose the theme for the next month's. It's just for fun, so I'm sure everyone can come to a consensus on something. If you need any help, send me a PM (I tend to be pretty busy these days).
You can use this forum for both Construct Classic and Construct 2 competitions - don't forget to specify if you want to run a competition for just one in particular, or both.
We also used to run 1-hour competitions which were popular in their day. If you want to organise something similar on an impromptu basis, feel free to make a thread, but make sure you post far ahead enough in advance to give everyone time to find out about it too.