Same with sunnydays. While I don't outright tell them what we practice, I state on my forms that we will be celebrating Christmas, Easter, and birthdays, among other holidays. If a parent did have an issue with this, it's their responsibility to bring it up. Same goes for diet, and I have a specific section on my forms that asks if there are any foods the child can't have due to religious practice.

Other than that (and holidays) it doesn't really impact me, so I don't feel the need to ask.