The OP’s profile indicates that he/she rides their bicycle to Mass. It can be presumed that the poster is under the legal age to drive. It can also be presumed that summer camps, on average and by definition, are rural in nature and likely some distance from populated areas.Were a minor taken to a summer camp with obviously no independent way to get to Mass on their own, the question is clearly whether the Mass obligation remains. Also obviously, summer camps charged with the safety of children are not in the business of letting them leave camp on their own (per your comment about “not allowing you to leave”). Neither would they be staffed in such a way that a counselor could be spared to drive a camper(s) to the church(es) of their choice.