I would go! But I have a different approach than most daycare providers in that I am okay with creating personal ties through my daycare. We live in a rural area and I have always had my own kids in the daycare so we have been to lots of DC kids birthdays and playdates too. I guess from the sound of it that I have been lucky to like and respect all the parents I work with (even if I do question their parenting at times!)
If I didn't have my own kids in my daycare then I probably wouldn't go. Or be invited either I guess