It's Time to Celebrate Ellen, Sunday, April 14, 3-5 p.m. at the Concord Armory, 91 Everett St. Concord. Honoring the 201st birthday of Concord's native daughter Ellen Garrison, educator and activist. Featuring a behind-the-scenes peek at the new Half the History film, Ellen Garrison, Scene from an Activist's Life, with producers Jennifer Burton and Julie...