Mystic, Frederick, Liberty, Otis, Baron and Winston invite to a fabulous evening Wednesday, May 4, from 6 – 8:30 at the Massachusetts Historical Society, 1154 Boylston Street in Boston.  Let’s break out the hats in preparation for the 142nd Kentucky Derby.  Festivities include a spirited Hat Contest for both gentlemen and ladies.  Ticket price includes complimentary libations and hors d’oeuvre.   Tickets are $150 ($125 under 35 years old) and may be purchased online at www.savebostonshorses.org using PayPal.  You may also mail checks made out to the Friends of the Boston Park Rangers Mounted Unit to PO Box 67147, Chestnut Hill, MA 02467.