I agree that the guests can either treat you as invisible or some kind of pipeing megastar, for unusual reactions to your pipeing the I can state that the north of England is the "wierd pipeing reaction" of the known world in terms of strange requests, daft questions, baffling comments, and picture opportunities,
turning up in full no1 dress with a set of pipes can often get you asked "whats your business sir?" by wedding planners, - once in a supermarket i was made to play a set of 6/8s by the "golden greeter" before I was allowed access, to prove I wasnt a deranged lunatic that was wearing highland wear as a disguise, while a man dreessed as an officer of the SS walked past without being challanged at all,
once asking for directions in a town called Bury in lancashire I was told by an elderly chap "first its the Bl$dy Koreans now its the Scottish! can you not just be satsified with your own country and leave us alone we dont want you here Pis$ off back to Ho Chi Minh city !!!!"

"can i have a go on them bagpipes mate?"

"Sorry we had a collection for you, but it was stolen" (excuse for no fee)

"I hate those things but the Mrs wanted them for the wedding , her dad was a sweaty sock"

"My son loves Wallace and Gromit,"

"my mum loved Scotland, especially the cheap drink"

"my mate recons you Jocks dot wear any undies under them skirts, is it because your so tight? you wont buy any??"

"It good of you to play for us, when were having drinks will you play something quiet and soothing in the background?"

"we visited Scotland last year, my husband hated every minute of it"

"mate put those things away., your in Britain now you know!! when in Rome etc"

"did you know those things are banned here mate? honestly yeh after your lot nicked that big stone from westminster Abby and that wallace fellow got the queen mum pregnant".