on basketball Rajon Rondo in good spirits at Celtics media day ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page jim davis/globe staff Jeff Green was surrounded by green basketballs to sign at the Celtics’ Media Day at the team’s facility in Waltham. jim davis/globe staff First-round draft pick Kelly Olynyk smiled while doing a radio interview. Players posed for photos, did promos, and answered questions from reporters. jim davis/globe staff Gerald Wallace listened to instructions while doing a promotional video. jim davis/globe staff Head coach Brad Stevens filmed a promotional video during which he was told to try to appear as if he was stressed on the sidelines. jim davis/globe staff Jared Sullinger had a laugh during a television shot. jim davis/globe staff Team president Danny Ainge was at the event.