There are also some BMW Club events at Calabogie Motorsports Park this year, the first one is on May 12th.
If you've never been there, the Calabogie track is 5km and 20 turns of driving delight! (assuming you're doing the full track)
More info on CMP's web site here
To be honest, last year the BMW days were some of the more expensive ones, I went to the local general car club's events instead (MCO
- Motorsport Club of Ottawa).