Oh no, the Parrotheads are coming. The Parrotheads are coming. Lock your doors. Put bars on the windows. Call the cops! Why is it that Boston, which has delusions about being a world-class city, every now and then behaves like East Podunk? Latest case in point: two proposed Jimmy Buffett concerts at Fenway Park. Now it's no great secret that for Buffett fans - Parrothead Nation - the concert itself is only half the fun. The real event simply must include a little tailgating in the Margaritaville spirit. (How else to properly show off those wild and crazy Hawaiian shirts?)...