Not everyone is holding their breath to see what the Celtics do with their first-round pick. On the eve of the NBA Draft, Kelly Olynyk, the team’s first-round pick last year, was hanging out with the kids at the Boys and Girls Club in Lowell. The stringy-haired, 7-foot center even played some drums at the opening of the club’s new recording studio, funded in part by Boston Celtics Shamrock Foundation.Mark Shanahan can be reached at firstname.lastname@example.org. Follow him on Twitter @MarkAShanahan. Meredith Goldstein can be reached at email@example.com. Follow her on Twitter @MeredithGoldste.