Howdy - I love Calagator, both as an event organizer and as an attendee. Thank you!
When I see what is very likely spam, I delete it, and have done so four times in the last two days. However, it usually resembles a rewrite of a prior legitimate posting. Without something indicating a revision count, I don't know for sure that it isn't a re-edit of a legitimate event that I might somehow revert.
A FAQ or User's guide (clickable from the banner) could tell me the best way to help with these spams, and make sure I am not erasing a real event a few revisions back. I don't have time to help a lot, but many of us can help a little if we know the best way to do so.
It might also be helpful to keep track of the source IP addresses; 95% of the spam and exploit attacks on my server are from a small range of addresses in China, and I redirect that block to 127.0.0.1 .