Muggle's get special visitors

[lizvega2]

No: HPFGUIDX 92497

O.K., so the muggle children get special visitors, in lieu? of 
letters, to explain the magical world to their parents. Since we 
know that it's not the ministry sending the letters to the 11 year 
olds, we must assume that Hogwarts is also sending the messengers. 

Who? I know that Hagrid was sent to get Harry, but, surely, he would 
not be sent to the other muggle's homes. Imagine Hagrid squeezing 
through the Granger's door, and talking to her dentist parents? I 
don't think so. I think Hagrid was sent for Harry, because 1) He 
already knew Harry's situation, and 2) Vernon and Petunia didn't 
need a damned thing explained to them, other than a guide on moral 
behavior, but that's for another topic. 

So, who is sent to the other children's homes? It would have to be 
somebody that could pass as a muggle, at first glance, anyway. Would 
it be McGonagall? She sends the letters...although, Jo did say 
visitor(s) plural. So, if it is McGonagall, who goes with her?