Gilbert and Sullivan and "Ruddigore", which were less successful than the seven other operas from "H.M.S. Pinafore" to "The Gondoliers", Sullivan asked to leave the partnership, saying that he found Gilbert's plots repetitive and that the operas were not artistically satisfying to him. While the two artists worked out their differences, Carte kept the Savoy open with revivals of their earlier works. On each occasion, after a few months' pause, Gilbert responded with a libretto that met Sullivan's objections, and the partnership was able to continue successfully. In April 1890, however, during the run of "The Gondoliers", Gilbert challenged Carte over the expenses
International Gilbert and Sullivan Festival Production" (for performers under 21) and a "Bus Pass Opera" production (for performers over 60). A "Unifest" competition among university groups is presented simultaneously, as part of the Festival fringe. While the amateur productions compete during weeknights at the Festival, there are weekend professional performances given by companies such as the Carl Rosa Opera Company, Opera della Luna, the New York Gilbert and Sullivan Players, Charles Court Opera, and the Festival's self-produced National Gilbert & Sullivan Opera Company, which has starred such well-known G&S performers as Richard Suart, Simon Butteriss, Bruce Graham, Gillian Knight, Barry Clark, Michael Rayner, Patricia Leonard,