Favorite Ideation Facilities

What are your favorite facilities for hosting ideation sessions and workshops?
-In the U.S.? Intl. ?

Just looking for inspiration and suggestions for planning an event. Thanks!

The local branch of the HUB (http://www.the-hub.net/) is where most of the best creative events take place up here.
Also at the Shopify headquarters, maybe check if any local post-startups have a cool space they rent out?