Kooky Ringo Star buttons: approximately 10 (photo: TBD staff)

Today is the last day of the Beatles-inspired music festival Abbey Road on the River on the National Harbor. Yesterday, TBD checked out the scene, saw a lot fewer people in Sgt. Pepper jackets than one would expect, heard a lot more decent karaoke than one would expect, and made a mathematical assessment of the day's sights and sounds.

Number of...

Beatles t-shirts on display: Hundreds

Beatles dresses on display: One, worn by Yamel Figueroa, fan club president for The Jukebox: Tributo a los Beatles, Puerto Rico’s No. 1 Beatles tribute band

Styles of Beatles baby onesies for sale: Five

German-speaking Beatles tribute band members: Four, all of Lucy in the Sky

Wacky Ringo Starr buttons: Approximately 10

Wacky Ringo Starr buttons from the drummer's Sun Country Wine Coolers ad campaign: One

Members of the Obama administration rocking out: At least one, Rahm Emanuel. The White House Chief of Staff attended, with his family, and was singing along to “Eight Days a Week,” "Ticket to Ride," and “A Hard Day’s Night,” at various points on Sunday

White House Chief of Staff Rahm Emanuel listening to tribute band Lucy in the Sky. (Photo: TBD staff)

Rahm Emanuel rocking out. (Photo: TBD staff)

Beatles tribute bands from the land of chocolate-y goodness: One, The Resistors, of Hershey, Pa.

Motorcyles bearing beautiful hand-painted images of John, Paul, George, and Ringo: One (see below)

Close-up of the Beatles bike. (Photo: TBD staff)

Styles of Beatles Suits on display: Four, including a "Shea Stadium" model

Stages: Five

Inspired renditions of Beatles songs on the karaoke Stage: One, a poignant mother/daughter version of "Blackbird"

Uninspired renditions of Beatles songs on the karaoke stage: At least three.

Canadian tribute performers who look/sound like Bruce Springsteen: One, Hal Bruce

Minutes original Beatles drummer Pete Best spent talking about the Hamburg show where John Lennon dropped trou on stage, while wearing a toilet seat around his neck: Approximately three

Number of minutes original Beatles drummer Pete Best could've spent talking about the Hamburg show where John Lennon dropped trou on stage, while wearing a toilet seat around his neck without losing the crowd's interest. Approximately 60

Average number of people dancing in front of main lawn stage at any given time: 28