Although I agree with the other posters about saying it is okay to take your son, I would like to offer up my own experience at V&A's.
I am the world's pickiest eater...In fact, my credo in life is "Pick and flick".
...as in, I "pick" through my food and then "flick" out the stuff I don't like!) I don't like 90% of the world's vegetables, I don't like beef, and I am not much of a bread eater. My husband says I could probably be happy existing on a diet of chocolate milk and tacos, and he would be about right.
Having said that, my DH and I went to V&A's 2 years ago to celebrate our anniversary. I was dreading the whole experience, just knowing that we were wasting some hard-earned $$$ on me, since I knew I would be picking and then flicking out most of the food. But I went anyhow, to indulge my husband.
All I can say is, WOW!!

I couldn't even begin to tell you what we ate that night (it's probably best that I didn't know!), but every bite was pure pleasure. I think it must have been how they blended things, and then the sauces they used...I never flicked! At all! If anything, instead of doing the 'flick', I was practically doing the 'lick'! As in licking my plates clean!
So, I'm just suggesting that you reconsider going with your DH; you may really, really enjoy it, and it would be a treat for your DH to have his beautiful DW sitting with him at dinner....it could be a night to remember! I know it is with us...my DH STILL talks about that dinner! I am SO glad I went!