What do you mean "when is the party starting"?  It's already started! 
* Khablan points to the boiling cauldron of witches brew and the assorted cracked punch cups beside it, not to mention the spider cookies and chocolate-newt's eye clusters.
Excellent costumes, peeps!  
And here's a link to a perfectly spooky little web game I've put in our Arcade section - 
Kookin Kids!  How many kids can you dump into the cauldron?  It isn't as easy as it might look at first!