The artists and writers at Hallmark are hard at work every day saying "I love you" for us. And today, one of the world's largest creative staffs puts on Hallmarket: a Hallmark Artist Art Fair, from 10 a.m. to 5 p.m., in Hallmark Square (2450 Grand, 816-274-3613), in front of the Hallmark Visitors Center. It's all non-Hallmark-commissioned works from those painters, designers, sculptors and photographers who make a living from making you appear more thoughtful to others. All proceeds go from your pocket to the artists, so show your love by buying a piece of art or two (with cash or check only, please). Call it your amnesty day for all those thank-you cards you've never written.