What was Arthur Weasley doing when he was bitten?

[ntillman]

No: HPFGUIDX 98991

I have been searching across the internet for fact or discussion or 
theory on this point.  JKR is deliberately not explicit about 
activity or place when Mr. Weasley is bitten in OotP (p.462).  As 
far as I can tell, the location is an important wizarding place, 
with metal bars, stone floords and at least two headmaster pictures 
(Everard and Elfrida Cragg) upstairs.  If this has been munched over 
before, I beg pardon and would appreciate being pointed in the 
proper direction.

-nrt