It’s that time of year when there’s a good deal of coming and going on the Broadway stages of midtown Manhattan. A Chorus Line may be ending its run Aug. 17, but Mario Lopez is enjoying his time “stepping up to the line,” as the posters say. Young Blake Bashoff is exiting Spring Awakening but only to head out on the national tour. And, [title of show] arrives on Broadway as the first musical of the new season, leaving co-star/co-creator Jeff Bowen pleased as proverbial punch.