Comedy Bar is our UCB-esque comedy venue - comedybar.ca. It looks like their June schedule isn't complete yet, but their weekend shows are generally a good bet.
My favourite vegetarian food in the city is from Rancho Relaxo at College and Spadina, near Little Italy - they have lots of veggie and vegan options on the menu, but they'll also make any non-vegan dishes vegan or vegetarian. Amazing Mexican food. If you like Indian food, Siddhartha in Little India is great too.