Classes are a very safe bet but pricier. Lowkey grassroots event are also easy and cheap but harder to find. Festivals/raves > shows > clubs are more variable cause it's loud af and way less intimate but people are gonna be high and super friendly. Note mainstream clubs interactions are gonna be interpreted as flirting, and ime first interactions with people when we're both high af never goes stronger beyond that (i.e. drug/party buddies)