I was concerned there would be drama and stress when I went to my brother's wedding. Frankly, everyone was so caught up in their stuff and in the wedding, they didn't care about me much. Plus, because it was not a family event (like the holidays) but an event that included family and friends, all the family members were on their very best behavior.
Now, even though I avoid any holiday gatherings, I would jump at the chance to go to any weddings. Then I get to see the very best side of my family members.
If possible, don't give into whatever drama and nonsense is going on amongst them. I hope that you do listen to your wife and go for a short while, enjoy some yummy reception food, and have a good time with your wife, if no one else. Maybe see it like a date night - a safer adventure for the two of you. If your family is being weird, go sit with the other folks at the reception. (I did this and it was helpful.) If they are being too weird, then you two can leave and still celebrate that you were able to spend some time together as a couple doing something a little different.