I believe that the info for the LCBO tag days is somewhere on the message boards here if you do a bit of a search. I know you have to send a letter to the head office but I don't have all the info. I do know that for Wal-Mart you need to contact the store manager where you want to do the tag day. Each Wal-Mart would be handled by that store manager. As far as any other store, I'm assuming each company is different. It's usually easiest to just go in to the stores and ask.
Good luck!!
__________________
Team: The Travelling Ta-Tas
2011 will be my sixth year walking, but it will be Ottawa this year.
I just took my donation form into the LCBO and used that as proof of me doing the walk then they sent me a letter from head office outlining the date that I could set up my begging booth. Best of luck! :)