OPENING ALERT: LONE STAR TACO BAR’S EAST CAMBRIDGE OUTPOST OPENS JULY 5 Written by DAN MCCARTHY Posted June 27, 2015 Filed Under: Eats, LIFESTYLE There's some invite-only soft-opening parties to be had, but as of Saturday July 5, fans of all the Mexican cantina-ness of the original will finally be able to land the same in Cambridge.