I think that the helmet will be a give-away that you cycled there no matter what. Since Vancouver is a bike oriented city, you might be able to generate bike conversations with people you don't know during that party. If people tend to go to this type of function in suits/business attire, then I would NOT bike there. But if people go to this type of function in shorts/T-shirts, I think that biking there will probably be a fun conversation topic starter.

But, this is just my 2 cents from me, a non-politically correct woman.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle