My best mate is getting married this month and my wife and I are taking a trip from where we live in Europe back to America in order to attend the ceremony where I will be a groomsman. My friend was my only groomsman outside of my brother for my own wedding and we don't see each other very often so this is a really happy event for me. Leading up to the big day there are a couple of get together's we've arranged, one is dinner and drinks while the other is a DnD game that I'm going to DM.

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My wife and I play DnD together and originally I set out with the notion that she would play along with the group as well as with another couple (husband and wife) who are close with the groom and who are hosting the game. I thought it would be a good opportunity for my good mate and my wife to bond as they also haven't spent a whole lot of time together. My mate decided that he wanted more of a 'boys only' event and switched out the guest list so the two wives are not invited. He also asked that the dinner and drinks event be lads only and feature the same people, all his close friends.

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It's my mate's wedding so what he wants he'll get, I'm not going to argue with him or try to arm twist him into including my wife. I thought it wouldn't be a big deal to count her in as no one involved is really the traditional bachelor party type and she's a fun, charming person. My wife is quite upset about all of this and is starting to become unhappy as the trip grows closer and closer, I know that she can get moody and passive aggressive and I'm worried that she's going to make this trip unpleasant as a result. I understand why she's dissatisfied about the situation and wish I could change it but ultimately I'm feeling guilty for enjoying the first time I've seen my good mate in years.

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Is there something I should do to defuse the tension or is the best thing to do go forward and accept that this will be a wrinkle to iron out later?