noun
informal wedding party; 1.5次会
A casual wedding celebration held between the formal ceremony/reception and the after-party (二次会). Often a standing buffet-style event for a wider circle of friends and colleagues.
See also: 二次会
最近は、披露宴の後に1.5次会を開くカップルが増えている。
Recently, more couples are holding a 1.5次会 after the wedding reception.
1.5次会は立食形式で、友人や同僚も気軽に参加できる。
The 1.5次会 is a standing buffet style, so friends and colleagues can join casually.