Sincere thanks to all of you who have volunteered to join the DCist team for this year’s Servathon. Forty-six of you will be rolling up your sleeves and getting dirty with us on May 3. The good news is Team DCist finally has a site — Harriet Tubman Elementary School at 3107 13th Street NW. The school was chosen primarily because it was one of the few places that could fit our massive numbers of…