Of course you should go! What a perfect example of a man wanting attention so much that he'll actually try to make you feel bad for doing something important to you. It's not even a purely social activity - it's work-related! Message to Planet Man-Child - "Your people have invaded the Earth... please come and get them back."
My ex-DH had a habit of suddenly complaining about "not feeling too good", whenever we'd planned something like a party or a big family dinner at our house. It was always early on the day of the event, i.e. as soon as he realised/remembered he was actually going to be expected to help. He was all for doing it in the weeks before, at the initial stage of inviting people - it wasn't like it was my idea that I'd forced on him. The first couple of times, I fell for this nonsense and did bloody everything myself while he lay around watching tv, occasionally letting out a big sigh or a groan.
By 6pm with all the hard work done, he would miraculously recover and then have a lovely time all evening.
Finally, one day when he started at 7.30am with the I-don't-feel-so-good nonsense, I said "Oh, well, we'll have to cancel. Okay, you just ring everyone up and tell them it's off. Then all you have to do is find room in the freezer for all the food and put it away, then you can lie around and recover. I'll go round to my friend's for the day".
Of course, he changed his mind then and got on with it. Didn't try it again, either. Knew I'd sussed him. But just one of the many reasons he's the ex-DH.
You go, OP, and have a lovely time.
