This is a heads-up that the LAST National Zoo Sunset Serenade of the summer takes place tomorrow night—Thursday, August 5th (weather permitting), from 6:30 to 8pm. If you have never attended any of these free outdoor concerts, then this is your last chance (this summer, anyway) to pack a picnic dinner and join the fun on Lion-Tiger Hill. The evening usually ends with spontaneous barefoot dancing. According to the Zoo website, tomorrow’s group is The Grandsons, performing from their WAMMIE Roots Rock-winning albums.