Compa (or Kompa) is student slang that comes from the English word “company.” It refers to a party organized by students, especially by club members. Among the most popular club kompa are shinkan‐kompa (welcome parties) and oidashi‐kompa (farewell parties). And there are also go‐kon (short for godo‐kompa) arranged among different universities. Students often take advantage of kompa to find girlfriends or boyfriends.
A matchmaking party is often held between single men and women even if they become working adults. Your senior at work may ask you to “WANNA GO TO A go-kon?”.