NEW YORK — Broadway’s box office took a slide in the season’s first frame following Memorial Day weekend (May 30-June 5) — but with the spring slate headed toward June 12′s Tony Awards, it was still a good time to be feeling a little awards heat.Buzz-magnet tuner “The Book of Mormon” ($1,173,580) was one of the few shows on the boards to post a gain. It was only a slight one, but it repped another house record at the Eugene O’Neill Theater. Best play nominee “War Horse” ($909,093) barely faltered, while musical revival “Anything Goes” ($742,624) played to 100% capacity despite being down about $95,000. Total Broadway cume fell $3.1 million to $20.6 million for 32 shows on the boards, the lowest number of shows running in three months. The 22 musicals grossed $16,796,487 for 81.5% of the Broadway total, with attendance of 193,858 at 79.6% capacity and average paid admission of $86.64. The 10 plays grossed $3,802,298 for 18.5% of the Broadway total, with attendance of 51,111 at 64.5% capacity and average paid admission of $74.39. Average paid admission was $84.09 for all shows.