The season at NCT begins with laughter. “The Producers,” winner of 12 Tony Awards, starts 2013 in January and February, followed by “Legally Blond,” the stage version of the Reese Witherspoon movie, in April and May. “Forever Plaid” in July and August returns you to the 1950s for a listen to the music of the great harmony groups. (Ardentown, 475-2313, nctstage.org)