i don't think it's rude, exactly, but i do think you should rethink whether or not you can fit them. we have just done a whole slew of 1st birthdays among our friends, and it was a nice opportunity to get to know some of my closest friends' partners, and those meetings have led to other socializing which has been great.
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you're going to have three groups of people:
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those who will come with their partners because they want to stay together as a family on weekends, and because they want to socialize with their friends' families.
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those who will only come with their babies because their partners aren't interested in going, have other commitments on that weekend (such as work, sports etc) or just don't mind spending weekend time without their partners once in a while.
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those who won't be able to come at all because weekends are filled with spending time with family, traveling, or other commitments.Â
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we have had a LOT of weekend birthday invites over the last few months, and we have fallen into each category at different times. i very much doubt that every single person in your group will be able to make it, and i doubt even more that every single partner of the people that do come will be there. if your apartment is small, that is perfectly understandable, and people will still be happy to come and spend some time there, but there is no way all 26 possible guests will all be there.
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i think it would be rude to state that you aren't inviting husbands in a more overt way, and you will be missing out on some good relationships if you do (not to mention, how boring for your husband to sit in a room of 12 women that he hasn't met). a better way to mitigate the crowding would be to host a more "drop-in" style party, so it's more accommodating of people's schedules, and not everyone will show up at the same time.