OPEN Registration for the 2017 season: Monday, Nov. 7 & Wednesday, Nov. 9; at Grandview Elementary School in Derry. Stop in either night, anytime between 5:30-8pm. 2016 TU International Champions! Diamond Dolls Twirling was established in 1999. Based in Derry, PA, we offer both team classes and private lessons at both the recreational and competitive levels. Our competitive teams and soloists compete in NBTA and TU competitions, and hold many titles in both organizations at various levels.