new members (e.g. club); new students; freshman; event to welcome new students, club members, etc. (e.g. welcome party)
① あまり交際のない人たちが打ち解けた雰囲気で親しく交わること。
party to welcome (e.g. new employees) and send off (e.g. retiring employees)
to enjoy oneself to one's hearts content; to enjoy oneself to the full
enjoying pleasure together