Check out the scroll line message below from one Philadelphia area Card Shop.
This is a page from Carl's Cards where you can read the full message. I have picked up some cards and supplies there in the past. They have a mix of singles, packs, and vintage - but I think that the real $$ is made off there Memorabilia and plaques.
I have not been to one of their signings yet, but give them credit for getting a message out to let their fans know this signing had been canceled.