It won't affect the club in any way shape or form. When Spurs aren't using the stadium it is literally sitting here doing nothing. I couldn't care less if the place has more cirque du soleil going on there during a calendar year than football, Spurs will always be playing there when there's a game to be had.
I genuinely don't see the reason why anyone would have an issue with us making use of the stadium for as many things as possible, I don't see any issue on us doing so at all if it helps to generate more funds than it being idle 13 out of 14 days all year.