I'm not 100% sure but when we exited the Despicable Me ride (into the gift shop, of course) there was a dance party going on which included a meet and greet with three minions. However, the second time we went there we didn't see them so I'm not sure if it is random or scheduled but you can definitely still see them 'for free' in the park.
You can also access this through the gift shop if you don't want to queue for the ride!!