For chant lovers and emerging scholas in the English speaking world, the grand and glorious event of the year is the Summer Music Colloquium sponsored by the Church Music Association of America. This year (2006) the dates are June 20 through 25, at Catholic University of America. Here is a brochure that you can and should distribute at your parish. You can also register online.
For instruction in chant and polyphony, nothing else can compare, and the opportunity to sing at Mass every day at the Shrine of the Immaculate Conception can't be missed.