If you happen to be in Calgary on the last Sunday of May there's a mini-tri - 300 m swim, 12 k bike, 3 k run. I know it's not what you're here for, but if you're feeling like you missed the summer then it'd be an easy way to just do something for a half a day. Although, it's the same day as the Lilac Festival so if you are here then hit then festival instead.

BTW - I love Queen.