[munificent]

I think I met the majority of my dating partners including my wife on a dancefloor. (Well, technically I had met my wife before. But we reconnected at a club.)

Dancing at nightclubs is great. Assuming you can find one whose crowd is your kind of people, it's one of the few remaining venues where people of all genders and orientations mix and it's considered socially acceptable to initiate a conversation with someone with romantic intent.

The problem with being a grocery store employee to meet people is that there are a very logical taboo against hitting on employees that are obligated to interact with you. Likewise, employers generally don't want employees hitting on their customers. So, sure, you might be able to meet people this way, but you have to skirt some social norms to do so.

[michaelteter]

Nightclub dancing is usually social dancing, not dance training. Yes, nightclubs can be good places to meet people (and potential lovers/mates). But dance classes (dance training as per the study) is very different.