By all means, go! I couldn't imagine a a quilt guild that wouldn't welcome you. (I can also tell you that the workers in the guild are just quilters, not paid employees. They like to quilt-- so they may not be checking their email -- or their post office box -- daily (or even weekly). Once they do check, they may have to forward it...
Go, be friendly and I suspect you'll find friendship and inspiration in the guild.