Gness similar happened to me few years back bought 2 tickets for the Havering open air concert in the park with orchestra- Land of Hope & Glory the works etc. paid good money too, pal came over for the weekend [ CS working aroad] on Sunday we carted a table for two,folding chairs , tablecloth, vase with flowers,champagne flutes,hamper laden with goodies and plonked ourselves down with the Sunday papers, thought we might be a tad too early as we could hear scaffolding being erected and could see in the distance a stage being completed fof the concert. WRONG--- a passer by out with dog out of curiosity asked us what we were doing then went into uncontrolable laughter the concert had been the night before and they were dismantling the stage ! no we did not brazen it out we crept away with our tail between our legs, If only I had looked at the tickets !