Definitely take your cane. That is a clue to clueless people in social situations. You can also take a more humorous approach and were a name tag with some funny quote or something on it that explains your situation without having to spell it all out. I think most people would know something was up if you have your cane. Without the cane, it may be a different story. So, go have fun and enjoy seeing family/friends and just doing something different.

BTW - When I first read your post (and others) I thought, oh she should talk to her boyfriend if she's thinking of not going to his wedding, assuming you are a participant in the marriage and he's not marrying someone else. Then I realized you were talking about your best friend.