Around this time last year dh and I went off for a concert he'd booked at the Festival Hall.
We found what was supposed to be the right auditorium, but there was no audience, just what looked like a rehearsal going on.
So we asked a couple of staff members who were passing, who checked our tickets.
Er, it was the right day and month - but the wrong year!! 2019, not 2018.
The (young!) staff had a good laugh with us, but I dare say they were thinking, 'Poor old things, it's a shame....'.
Still, we had a nice drink at the riverside bar, and a Thames-side walk before heading home. And thanks to the good old Freedom Pass, we hadn't even wasted train fares.
(All entirely dh's fault, of course, since he was the one who'd booked the tickets and put it in his diary!).