Noun
(in-person) meetup (of members of an online community); IRL meetup; offline get-together; offline gathering
2人っきりでデート・・もとい、OFF会だと思ったけど、そこまで甘くもないよな。So I thought my date, er rather, offline-meeting was going to be just me and her but things aren't that easy.
Also written OFF会【オフかい】