Yeah but honestly, I did not realize that the fight was going to be 4pm local time for you. That's got to be a terrible time to watch a fight. Might as well bring your Bro to the reunion with you, have a good time and show your wife that you are the better person, then watch the fight with your bro in the evening and even go out after the fight for a few. It would be way more relaxing that way. Otherwise, if you F off for 3 hours to watch the fight while the reunion is on, you will be thinking about the potential shit storm thats brewing with your wife the whole time, and you will be rushing to get back.
I can see your point of view. I am not certain because my wife wasn't certain of the family schedule, but I believe that at 4pm they are going to be at an amusement park. So everyone will be riding the rides, etc... I don't see how leaving an amusement park is a big deal.