Back when I was playing minor ball, we'd have indoor training and practice in school gyms, soccer centers, etc. Usually started up at the beginning of April.
If you're serious about getting involved with some little league in Calgary, Dennis Baumgartner is probably still the guy to talk to. Happens to be the father of former Canuck Nolan Baumgartner. Dennis has been around as long as I can remember, and I owe a lot of my love of the game to him. I was fortunate enough to play 3 years for him in the early 2000s as well as a couple years of summer all-stars.
His contact info is still up on the Bow Ridge site, so I assume he's still involved in coaching. I'm sure it would be a great experience to coach along side him, or he may be able to at least point you in the right direction. If you do happen to get in touch with him, tell him 'Hero' says hello

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