There has only been one time, where we "partied" after a funeral.
The father of my DH best friend/2nd cousin, had passed away. During my DH's teen years, on into adulthood including when we meet and started dating, a good part of every Friday and Saturdays was spent at this families house.
They had a finished basement, with a pool table, ping-pong table, pinball machine, stereo, poker table, and a bar. No need to be preaching about underage drinking, but we did a lot of drinking and card/pool playing in that basement for 5+ I was around. Every major holiday was spent at their house. The welcomed us young adults into their home. They had house rules that we knew we had to follow and follow we did, even when we all had hit 21+, we still followed the rules.
So, when the widow invited, at the funeral dinner, our group of friends back to the house for a Saturday night of visiting, we did. And we did, exactly what her hubby would have wanted us to do. Drank beer, listened to music, shot some pool, played Euchre, and had a good time. As DH and I were leaving, she told us that as long as her son was going to be around, we were more than welcome to come hang out and enjoy ourselves. She got all teared up, made a comment about missing this, with all of the kids grown and gone. And for the next 6 weeks, she got her wish.