Stache Bash is probably the biggest mustache get-together in recent times. The celebration is put on by the American Mustache Institute and they estimate the attendance of the event to be at least 1,500 people.

The event is scheduled for Friday, October 30, a day before Halloween. As such, Halloween costumes are strongly encouraged. If you need an idea of what sort of a costume to wear with your mustache, check out Stachist’s mustache Halloween recommendations.

Headlining the event will be the mustachioed John Oates.

The winner of the 2009 Robert Goulet Memorial Mustached American of the Year will also be announced after nearly 100,000 votes were sumbied on the AMI’s website.

The deets:

• In St. Louis @ the Orpheum Theater
• $29
• 21 and over
• John Oates is playing!