NEW YORK, June 15 : The SpaceX IPO went off with a bang. Now investors turn their attention to a jam-packed calendar ahead for Elon Musk's rocket, internet and AI firm that may bring volatility. Just in the next two months, the sixth-largest U.S. listed company by market value will have a handful of events – ranging from the listing of options to the expiration of investor holding periods to index inclusion – that could help dictate trading in its shares and the broader market. Friday's launch