noun, noun or participle which takes 'suru'
group blind date; mixer; joint party
Abbreviation of 合同コンパ. Typically a casual gathering where two or more groups, often male and female students or young professionals, meet to socialize and potentially form romantic connections. Can be used as a noun or with する to mean 'to have a mixer'.
See also: 合同コンパ
I'm planning to go to a mixer with my friends next week.
合コンで知り合った人と付き合い始めた。
I started dating someone I met at a group blind date.