Employees at McMinnville Post Office are “all shook up” over the upcoming release of the Elvis Presley commemorative forever stamp this Wednesday.“We have decided to commemorate the release of this stamp with a customer appreciation day,” said McMinnville postal supervisor Sherrie Honea. “We are excited about this stamp. We hope the public comes out on Aug. 12 and enjoys a piece of cake and some punch with us. ‘The King’ might even make an appearance.”Presley, also called The King of Rock ‘n Roll, is regarded as one of the most significant cultural icons of the 20th century.