MAZEL TOV!!!!!!
I recall when a couple in our community had this situation (I grew up in a small community & this happened when I was in high school- a long time ago).
They invited the whole community- including high school students (prob about 100-150 people, total)to the ceremony and a small reception (cake & drinks) and dancing afterwards. Then they had a seuda/sheva brachos with a minyan+ (I think about 10 couples they were friendly with). The dancing with everyone was very leibadik and quite beautiful!!!