Many of them were women, swooning as Chris MacDonald bounced on the tippy toes of his black boots singing "Heartbreak Hotel" and squealing when Quentin Flagg shook his hips to "A Little Less Conversation."
At Friday's event, fans got a preview of today's Elvis Lives in Hagerstown concert in front of The Maryland Theatre.
Master of ceremonies Jerry Mullenix introduced the five performers, saying there would be no lip-synching.
"Milli Vanilli, eat your heart out," he said.
Dixie Myers, 54, of Hagerstown, threw caution to the wind and joined performer David Lee on the dance floor for a little jitterbug.
"Elvis is my man," she said. "He's a hunk. Pretty eyes, pretty hair, nice bod."
Myers was treated to the evening out as a birthday present from her sister, Hallie Stotler, 51, of Hagerstown.
In between performances, fans drank from the cash bar and munched on snacks of barbecue weenies, fried shrimp, chips and pretzels.
Fans also got to meet the artists, who came from all over the country for the second annual event.
Although the female fans screamed the loudest, there were quite a few men enjoying the show.
"This is the best time I've had in a long time," said Douglas Lowe, 60, of Hagerstown, as he sang along to "Blue Suede Shoes."
Lowe, clutching a binder full of Elvis collectible cards, said he has a pair of blue suede shoes at home but wore his black, pointy-toed boots instead.
David King of Mercersburg, Pa., brought in a large local following.
Anne Todd, 60, of Greencastle, Pa., said she likes the fact that King went to the same school as her children, James Buchanan High School.
"He treats everybody so nice and respectful," she said.
Sarah Richards, 54, of Greencastle, Pa., has been following King for about 15 years.
"He's my number one man. He's the greatest. My husband knows it and (King's) wife knows it," she said.
Her husband, Don Richards, 52, said he took off work early to attend the event.
Juanita Klein, 53, of Hagerstown, had King autograph one of his cassette tapes she's had since 1988.
Klein said she plays the tape while she's working out on her stationary bike.
She's been a long-time Elvis fan, even marrying her husband, Frank Klein, because she thought he looked like Elvis.
The couple said they're planning a trip to Graceland in November.