I’m a historian and I’m going over some archival footage which contains footage of a (I think staged but I can’t be sure) pre-war frum wedding. I’d guess the footage is from between 1910-1939 in Poland. Though much of the dancing is same gender there is no mechitzah and men and women including the rebbe dance together holding a length of cloth between them to maintain shower negiah. I was wondering if this kind of shomer mixed folk dancing is seen in any frum communities today? I am part of a Chabad Shul and there’s always a mechitzah when we dance. If no communities do this anymore I was wondering what changed in terms of tradition or interpretation of halacha to make this less common?