Blue Goose Cantina opened its doors on Lower Greenville in 1984 — so in honor of its 25 years in East Dallas, there will be an 80’s-themed anniversary party Thursday afternoon at 5. Everyone’s invited to don their best ‘80s getup (think parachute pants and acid-washed jeans), come listen to some throwback hits from that decade, and enjoy $2.50 margaritas and beer all night.