It's the 40th anniversary of the Hanford Vintage Motorcycle show and swap. It was good when I went to it several years ago and imagine it should be decent this time around. A heads up for those within driving distance:
http://www.batorinternational.com/Bator_HANFORD_SHOW_rules_and_regs.htm
http://www.batorinternational.com/Bator_HANFORD_SHOW_rules_and_regs.htm