seance (n.)

• assembly
• assignation
• audience
• ball
• bargaining
• brawl
• caucus
• colloquium
• commission
• committee
• conclave
• concourse
• confab
• confabulation
• conference
• confrontation
• congregation
• congress
• consultation
• conventicle
• convention
• convocation
• council
• dance
• date
• diet
• discussion
• eisteddfod
• festivity
• fete
• forum
• gathering
• housewarming
• huddle
• interview
• levee
• meet
• meeting
• necromancy
• negotiations
• palaver
• panel
• parley
• party
• plenum
• powwow
• prom
• quorum
• rally
• reception
• rendezvous
• session
• shindig
• sit-in
• sitting
• soiree
• spirit
• spiritism
• spiritualism
• summit
• symposium
• synod
• turnout