There was an event just last weekend in Kowloon Bay (11 April), the Rainbow Gala 5....it was a bunch of doujinshi/other artists selling their work and there were lots of cosplayers there!!!
Not sure about upcoming events though, only know about the other major ones coming up in the summer.
Although I'm a foreigner living in HK, I'm still really interested in trying cosplay again..! Has anyone seen foreigners cosplaying in hong kong before??
Just curious!! Would it be really strange? At the convention I didn't see any, but I didn't arrive until much later in the day when things were winding down..... ^^