Very interesting. If the Mid-Atlantic folks don't know what it is, try posting on the perennial forum.

Likely Muscari Plumosum. A shot further away and to show scale/size and a shot of foliage would help.

Yup, I think that is it as well after doing more research. Here it is with more scale for those who are curious. I have no idea where it came from! I must have planted a muscari mix since there are others that were around it in the spring.