You could do this at any large function with lots of people.
(with permission as mentioned before) This could also benefit the site it's done at since it may help keep the area cleaner. People will want to try out the crusher so they'll throw thier cans in it instead of leaving them on the ground, picnic tables, storm sewers, shrubs, ect.
The only thing is if you're living in a deposit state you will want to eliminate the crusher since your cans are worth more being returned intact. Here in CT it's 5 cents a can/bottle but some states have it up to 10 cents. You will get more for your returnables than aluminum on a good day at a scrap yard.