Today's award goes to the Patrouille Suisse, the aerobatic display team of the Swiss Air Force, for this mistake.
A rather unusual as well as bit embarrassing “incident” occurred to the the Swiss Air Force’s “Patrouille Suisse” Display Team on Saturday Jul. 6, 2019: the team’s jets were scheduled to fly over Langenbruck, in northwestern Switzerland, south of Basel, where the commemoration of the 100th anniversary of the death of Swiss aviation pioneer Oskar Bider was held, but they flew over Mümliswil, missing the target by about 6 km (about 3¾ miles).
“Unfortunate circumstances” were the root cause of the mistake according to a spokesman of the Swiss Air Force. In fact, as reported by Le Matin media outlet, during the approach to the target, the leader of the team spotted a large festival area with a tent, with a tent in Mümliswil, which prompted him to fly over it. The 31st yodel festival in northwestern Switzerland was being held there: people attending this festival enjoyed the unplanned flyover.
There's more at the link.
I can't help thinking that the yodeling festival was probably greatly improved when the jet engines drowned out the sound of the alleged "singers"!