I know
On Lok has always catered for large groups/parties. They aren't gourmet/fancy Chinese but they get the job done. Food is alright at best for what you pay.
Map
2010 East Hastings Street, Vancouver, BC V5L 1T8
(604) 253-3856
On Lok's Menu on Urban Spoon - *Note* - I don't know how updated this menu is!