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The truth is in that big auditorium over there. You may not find all the answers to your questions or all the conspiracies revealed at “The X-Files Expo,” but you will find lots of cool high-tech exhibits, props from the show, celebrity appearances, tons of X merchandise, and even a sneak preview of the upcoming movie The X-Files. Interactive games, including the new X-Files CD-ROM, will be available for play, and the less active can have their photos taken “in” Agent Mulder’s office through the wonders of digital technology. (See if there are any Pez in his desk.) If you’re tired of hauling those Spock ears down from the attic every year, get with the new sci-fi program. Cigarettes optional. From 11 a.m.-8 p.m. today and noon-7 p.m. Sunday at the White Oak Naval Observatory’s Buildings 25 & 71, 25 Goddard St., Silver Spring. $25. (703) 683-1900. (Arion Berger)