Bris will move indoors. But the minyan won't need to move indoors
will they serve food? Hard to eat with a mask.
The baby has a mask...
Many health care workers are sick even with a mask, and a mask doesn’t work with a beard so don’t rely on your mask to much.
Personally I would sat that If you really are going to stay 10 feet away from anyone, not touch your face, and be really careful than the risk is low, but you really have to all go there with the mindset that all the other people are positive. Practically it’s hard to put on teffillin without a table, with gloves and a mask, etc. if anyone there is showing symptoms... don’t rely on a mask. Be careful not to touch much even with gloves.
Mazel Tov