Yes it's annual, plus there are two sales that are organized by the VOS in April and August I believe. There there is always the FVOS show in Sep/Oct. That's just the lower mainland. There's more on the island.
Those are some nice 'chids! I heard about the show from someone at my orchid society who was in town for the COC conference and was able to stop by. Just goes to show that a picture really is worth a thousand words! Thanks for sharing!