The Swaminarayan group requested no female attendance because their priests take a vow of celibacy which require them not to be in the vicinity of any female
https://www.bbc.co.uk/news/articles/clyenxp540vo
BAPS says the segregation of men and women was introduced for the benefit of women, but critics say 18th-Century beliefs have no place in today's world, and keeping women out in the name of religious practices is discriminatory.
I know someone whose mother has spent weeks working on the preparation for the temple they're talking about, unpaid.