There's no camping allowed at Shevlin Park. It's actually prohibited. There TeePees are for a summer day camp that the local Parks and Rec runs.
Bend Park and Recreation runs summer youth camps that incorporate an overnight camping experience in teepees, but there is no camping for the public at large.
It's only a day park and closes at sunset. I think there may occasionally be camping across the road where the lodge and teepees are. It might only be for reservations for large events though. As far as I know it does not have any traditional camping spots.
Thanks! Your answer is awaiting moderation.