If you make a post that elaborates the event in a way an advertiser does, like emphasising on its pluses and benefits with the intention of reeling more visitors in, we may consider it a form of advertisement (depends on how you write it).
If you only cover happenings on the event in a way a blogger does, like how people often write about conventions and perhaps also talking about possible meet-ups without advertising the event itself, it should be okay.
Ok!
So, something like this is not allowed:
ANIME IDOL EVENT THINGY 2012!
Venue: Planet X
Come and Join Us!
+ Has Anime!
+ Has Idols
+ Other gimmicks!
Tickets are only $300 and half a soul!
Get yourself ripped off at www.souleating.com today!!!
but something like below is OK?:
Anime Idol Event Thingy 2012
It's a event about anime idols and such being held at planet X, i went to
last year's one and it was great! This year their highlights include idols, anime and other gimmicks
The event itself is a little pricey for the half a soul and $300, but you should give them a chance to humor you. You can look up their page at www.souleating.com for more information.
If I had to be overly critical, I'd say even the second one still sounds like an advertisement. :p However, I'm not gonna be, and I can see that you're not the kind of person who made an account just so you could advertise an event you organise. Feel free to make your thread.