The Sewickley Valley Historical Society is showing The Spirit of ‘76 at Sewickley’s Lindsay Theater and Cultural Center on Thursday, April 30, at 7 p.m. Lucas Reiner directed and co-wrote this wacky sci-fi comedy about time-travelers aiming for the United States circa 1776 who instead land in 1976 as America is commemorating its bicentennial. Tickets for The Spirit of ‘76 are now on sale for $8.75 each. This screening will be immediately followed by a guest speaker discussion and Q&A.