Grammy-winning country music stars Alison Krauss and Union Station will perform Saturday night at Merriweather Post Pavilion. Gates open at 6:30 p.m. The show begins at 8 p.m. Tickets are $30-$75. Lawn admission for children 12 and younger is free with a paying adult. Merriweather Post Pavilion is at 10475 Little Patuxent Parkway, Columbia. For tickets, call 410-547-SEAT or go to ticketmaster.com.