St David’s Hall Saturday 15 July, 7.30pm   CARDIFF PHILHARMONIC ORCHESTRA celebrates its 35th birthday with a performance of Strauss’ mighty and magnificent An Alpine Symphony at St David’s Hall on Saturday 15 July. Since its inaugural concert at St David’s Cathedral on Saturday 19 June 1982, CPO has entertained thousands of concert-goers and established itself as one of Wales’ foremost non-professional orchestras with a loyal and talented membership. Now well into its fourth decade, the orchestra continues to go…