Am pretty sure it ends on last Sunday in September i.e. 28th this year. Here is last year's program:
Wine Harvest Festival in Binissalem (17/9/2002)
The programme for the "XXXVIII Festa des Vermar" in Binissalem began last weekend, although the main events will take place between September 21 and 29.
La "Vermada" (harvest), that is celebrated every year at the end of September, when the grapes are picked, is the most important fiesta in Binissalem. The whole character of this town from the Raiguer, emerges into the street; "fideus de vermar" (harvest pasta), street parades, dances and, above all, wine, will accompany this great fiesta of the people from Binissalem.
The programme for this year includes a wide range of activities: exhibitions, performances, "glosses" (rhymes), demonstrations, sport, and a long etceteras. A great part of the events is related directly to the wine harvest, such as the wine tasting course held these days in Can Gelabert, the grape pressing by feet competition that will take place on Sunday 22 at 6.30 p.m., the photographic exhibition "Temes de la Vinya, el Vi i la Verema" that can be visited in Can Gelabert, and the "2a Fira des Vermar" that will be held the last weekend of the fiestas, from September 27 to 29.
The traditional float parade "Vermada 2002" will take place on Saturday 28, as from 5 p.m., and the grape competition, and the homage "Ofrena a Nostra Senyora de Robines del Most Novel", by the selected "vermadors" and "vermadores", will be celebrated on Sunday 29 as from 11.30 a.m., just after the Mass.
originally published in
www.mallorcaweb.com Keep an eye on Mallorcaweb they may publish this year's program shortly. There is also
www.binissalem.com but all in Catalan & they don't yet have the program. You are looking for 'Festes de Vermar'.