Diagon Alley-Hermiones parents

[dragonettefish]

No: HPFGUIDX 42493

In the Chamber of Secrets in the chapter "At Flourish and Blotts" 
Hermiones parents are with her in Diagon Alley. I was suprised at 
this because they are muggles and I thought Diagon Alley was only 
wizards.  I suppose that couldn't be true because Hogsmeade is the 
only non-muggle community in Great Britian the book states but is 
Hogsmeade considered a community? I got off track there! Sorry!  
Anyways, I was wondering how Hermiones parents got to Diagon Alley. 
It says in the COS "They said good-bye to the Grangers, who were 
leaving the pub for the Muggle street on the other side..."  How did 
they know the pub was there and how did they get into it because in 
the first book it clearly states that Muggles could not see the pub? 
I dont think you could go into something where all you could see is a 
brick wall and if you could accidently walk in it wouldnt there be 
lots of muggles doing just that? Thank you and I hope someone can 
answer me with this frustrating question!

"dragonettefish"