I was just loooking at Martin Duberman's biography of Lincoln Kirstein. He has quite a bit about this "first season." For example:
-- Kirstein attended performances of the Sadler's Wells season and socialized with members of the company: "
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Seeing the work of Ashton and other English choreographers convinced Lincoln more than ever that Balanchine was "the only genius of the dance since Petipa," and it angered him that he'd still "not been properly seen except in his Stravinsky works." But he supposed that was part and parcel of Balanchine resisting "popular interest and acceptance," and he admired him for it: "he is ONLY a dancer; he hates painting; he dislikes pantomime, and hence the dramatic and spectacular elements are left out of our repertory with a few major exceptions"
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A week before the November 23 opening of the new season, the ballet had a $25,000 advance sale; that wasn't spectacular but it was higher than ever before. Due to run through December 11, the season was a week longer than previous ones, and its sixteen performances would play from Wednesday through Sunday rather than simply two days a week. All of which seemed a good omen and generated considerable excitement within the company. Happily, an omen for once proved accurate."
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The high point came with the premiere of Firebird on November 27. The audience gave it a clamorous reception, and the critics ... hailed everything from Jean Rosenthal's lighting to Maria Tallchief's dancing. Additional performances were immediately added (four in all), and [John] Martin warned his readers to "get your order in early." The day after the premiere Lincoln wrote Stravinsky that they'd had an "extravagant success," and he praised Tallchief as "absolutely miraculous, really a bird-of-fire."
A few days latger, [ ... ] Balanchine's second new ballet, Bouree Fantasque, debuted and received only a slightly less rapturous reception.
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Neither Cristensen's Jinx nor Dollar's Ondine fared nearly as well as the new Balanchine ballets, though Moncion, Janet Reed, and the upcoming Herbie Bliss were highly praised for their dancing. Jinx had more fans than Ondine, among them Sadler's Wells's director, Ninette de Valois, who, along with David Webster, [general administrator of Covent Garden,] attended often during the season.
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In the meantime Lincoln and Balanchine turned, with [Morton] Baum's encouragement, toward planning yet another four-week season, to begin a mere two months hence. The company had yet to turn a profit, but the final two performances in December had sold out, the critical reception had been splendid, de Valois had declared the company the most important in America -- and Baum was more convinced than ever that he had a tiger by the tail.
P.S. When the second season began in February 1950, advance sales were $50,000 -- double what they'd been for the earlier season.