Soon Buffet became a national celebrity – she performed at such famous "cafés-concerts" as the "Théâtre de la Gaîté-Montparnasse", the "Théâtre de la Gaîté-Rochechouart", and "Les Ambassadeurs". She also sang in less conventional locations such as the streets of the poorer neighbourhoods of Paris, and even at coal mines, in order to raise money for the poor and homeless. Buffet also performed daily at the Exposition Universelle of 1900, a world's fair held in Paris.