F.H.
HI K., I have a special needs daughter (autistic and mildly retarded). Although I don't think she will be dating (but who knows??!!) my first feeling is that I would want someone to be aware of her situation in case something happened. You said her best friend knows but now won't be there so I think the date should be told. Not everyone in the group has to know, but I think he has a right to just in case something does happen he would have some instruction on what to expect and what to do. I as a mom would feel better knowing someone was with her too that would know what to expect and what to do. And congrats to her on her big day (and night!)!!