OP, please listen to @cinnamon1212 – that’s the exact way to approach this.
I’ve posted about this before, including when it happened, but ds1 and his then-gf had just moved in together a few months earlier in a state about 1,000 miles away from both sets of parents and wanted us to meet at Thanksgiving and for us to share an Airbnb! Me and dh and them and their ds. The kids would stay at their own place, lol. Some here thought we were nuts to consider it, but you know what? We weren’t. It went great. Why would the kids set us up to fail, you know? If they think it will work, then trust them and recognize that this is the next step forward in your ds’s eyes. I would make sure that the gf wanted this, too, but if that answer is yes then go for it. What a great, happy occasion to meet her parents. To me, it’ll already be a happy time so that will take some of the awkwardness off.
And just to put a button on this: We flew home today from our fourth Thanksgiving together, with both families. The second Thanksgiving they had a Covid wedding in the same city we all first met, the third they had a REAL wedding in the same city and this, our fourth, dh and I flew up to the kids’ home and then we drove to the next state over so we could see where DIL grew up. We spent the holiday with the kids, her parents, her aunt and uncle and her grandparents. It was lovely. Go in with an open mind and assumed good intentions and flexibility and have a great time.