Mark McGrath teaches “Cape Cod Walks to History,” a Lifetime Learning course via Snow Library, on Tuesday, April 20th, from 1:30 to 3 p.m. “We will take walks, virtually, to places of Cape Cod history, recall the works of Thoreau, Hopper, and Oliver and uncover many little-known gems of the past,” according to the description. Registration is $10 at friendsofsnowlibrary.org.