U2: Rare Footage At The Leixlip Castle, July 27, 1980 This was an open Air Festival in Leixlip Ireland in County Kildare just across the border from County Dublin. The grounds of Leixlip Castle are about 10 miles from downtown Dublin as the crow flies. It was U2's first show at an open air festival before a large crowd, estimated 30,000 tickets sold for the day, although the crowd appears a bit smaller than that when U2 are on stage, probably early in the lineup for the day.
THE POLICE headlined the show:
The openers, not in order were:
John Olwan
Moondogs
U2
Skafish
Q-Tips
Squeeze
The video link is about 5 minutes and has some performances from the opening bands, fans walking to the venue, and several clips of U2, with U2's first stage prop being connected Pipes in the shape of U2 behind Larry.
At the time, U2 were still recording Boy, which was 3 months away from its release on October 20, 1980
At this point U2 had released:
EP U2-3 -September 26, 1979
Single Another Day - February 26, 1980
Single 11'Oclock Tick Tock - May 16, 1980
Here is the video link:
https://www.youtube.com/watch?v=F_icAbFMJ3k