For orchestras like the Boston Symphony, which have revered summer homes like Tanglewood, the long hot months are a celebration of easy revenue and casual concertgoing. But for the New York Philharmonic, which has no regular summer destination, what’s needed to get its home audience into the hall during the second season is constant innovation and, um, snappy slogans? “Welcome to Summertime Classics, the fun new festival of smile-inducing classics performed live for you by your New York Philharmonic, in a lively, colourful and refreshingly casual setting. It’s classics for your favourite sneakers, not your glass slippers.”