not a lot.

there's the stuff in LL and that's about it: I think Ridcully used to holiday near Lancre, and one year he and Granny almost did something, but Esme was too fast a runner and didn't know how to find a good root to trip over. She ended up meeting the fairy queen instead. They certainly didn't... you know... *cough*.... if they had Granny wouldn't have been able to capture the Unicorn. Mustrum became a wizard and didn't return to Lancre for 50 years.

Ridcully is first heard of in MP (I think)... or was it RM? anyway. He was very talented as a youth. He became a 7th level mage (or something) at a very young age and then left to the country to run an estate. A few decades later he was summoned back to the UU to be archchancellor.

So, ridcully wasn't at the UU at the time of ER. What you might be thinking of is a mention of Galder Weatherwax, a distant cousin of Esme and once Archancellor of UU. He was the one who installed BSJ's bathroom, and subsequently ordered it boarded up.

as for C) well, I think Granny thinks its enough to know that everything happens somewhere.

Esk, and the now non-stuttering Simon have not been heard from since ER, and the traditions surrounding not letting women into the university seem unchanged.

rob