PROVIDENCE, R.I. — A plan to build a new ballpark for the Pawtucket Red Sox could bring Rhode Island legislators back to the State House for a special fall session.Senate Finance Chairman William Conley, an East Providence Democrat whose district includes parts of Pawtucket, plans to introduce legislation Tuesday.Conley says he's submitting it now, just days before lawmakers are set to adjourn for the year, so that it becomes part of the public record "for all to see and scrutinize" in the months ahead.