Marcelo Gomes to Appear With the Royal Ballet February 2, 2012, 5:45 pm Marcelo Gomes, a principal dancer with American Ballet Theater, will perform as a guest artist with the Royal Ballet at Covent Garden in London on Feb. 9, Ballet Theater announced on Thursday. In his first appearance with the company, Mr. Gomes will dance the role of Oberon in Frederick Ashton's "Dream" opposite Alina Cojocaru, a principal dancer with the Royal. Mr. Gomes joined Ballet Theater in 1997.