Revolutionary Lewes walking tour, 2 to 3 p.m., begins at LHS, 110 Shipcarpenter St., Lewes. Sitting at mouth of Delaware Bay, Lewes was linchpin in defenses of America’s most vital waterway, just 89 nautical miles from Philadelphia, where whispers of independence were beginning to take hold. Cost is $20. For tickets go to historiclewes.org or contact 302-645-7076 for more information.