I love having girls nights/days/weekends!
I meet up with the other mums from school for coffee or lunch (I run my own business so it's easier for me but we try to organise it to fit in with as many mums as possible in our group).
We live in the country but if I go into the city for a day or for the weekend (if there's a trade show on for example) I always try to do lunch with women friends who live there or who can get a train in to meet up.
And recently I had a weekend away with old school friends. We try to do that once a year (save up our Tesco vouchers and change them for meals at places like Prezzo or something so it's a cheaper away weekend).
It's lovely, we can talk about absolutely anything (and usually do), we know each other well enough that there's no 'show' and we're not worrying about partners feeling out of place or being bored with the conversation.
DH does the same with his old friends.
But we also meet up with the same people as 'couples' pretty regularly too - I like my friends husbands or partners.
It's just nice to be able to talk more 'emotionally' sometimes with people you've known forever without feeling (or making some one else feel) uncomfortable. For example, one of my old school friends has a mum who may have Alzheimer's. As my mum has it she was spending a lot of time talking to me about dementia whilst we were away for the weekend and she got quite upset at times (as you would). My other friends and I didn't feel uncomfortable at her tears - we've known each other since we were thirteen so we've been through a lot of tears together. She was tearful over dinner one night. Now my husband or her partner may have tried to 'jolly her along' for the sake of the group, whereas we allowed her to be herself, talk it through and have a little cry because we recognised that she needed that.
I think you need to speak to your friends. Couldn't your husband organise a night out with the other men - opposite parts of town - if it's an issue with the couples evenings becoming a fixture?