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Mostly, you don't want your husband there because you're going to be nervous enough and don't want to be responsible for his fun as well.
At my ten, I went by myself to the Friday night get-together (at the local bar where we used to all drink underage), which got me over the nerves of meeting people I hadn't seen in years without having to worry about him as well. I explained this in advance, and he had no problem with it. Some other people brought their S.O.s, who ended up watching football and playing pool. At the formal dinner I was comfortable with a number of former classmates, and everyone had brought their S.O.s, so we were all in the same boat. After that, both you and your husband will know whether he's having fun, and can plan for any other events accordingly.
My husband had a pretty good time at my reunion, and I had a blast at his, he had some great friends.
The reunion will be odd but more fun and less horrible than you expect, as long as you've matured since then; you just have to deal with the people who didn't. Friendly drunk people you barely knew will treat you like an old friend; acquaintances from clubs will hand you their business cards; you will be stunned by the number of people who saw you around college or your current workplace but never said Hello; you will marvel at the fact that the football player remembers you from Calc II (there were FOOTBALL PLAYERS in Calc II???)Your friend who knew, I mean, EVERYONE will tell you the gossip on all the people you knew and many you didn't. And you will get all soppy and swear to keep up with everyone, but you probably won't at least until the 15th Year Reunion, if not the 20th.
Oh, and several of the popular people will conform to your worst expectations, but with luck you will have matured to the point where you mostly find it SAD that they truly haven't changed in ten years.
Take several deep breaths, take your husband, and have fun. A 10 Year Reunion is not to be missed. And if you have any lingering petty feelings toward former classmates...nothing beats having a lawyer husband to wave under their noses!