Everyone has their favorite places on the web.  These are mine.  Some are caller references, some are where to go to dance.

Square Dance Patter Calls

Pour Parler - an annual gathering of folkdance teachers

Bubba Guitar - Bill Martin's wonderful website

Square Dance History - an amazing resource about all kinds of square dances

Greater Puget Sound Region Dances

Seattle Family Dance - the Dance I run

Northwest Folklife Festival - my favorite event of the year

Seattle Folklore Society - they put on many wonderful concerts and sponsor some great dances

Contra Dance Links - the most thorough and up-to-date list of where to dance contras, all over the world!

Ralph Page Legacy Dance Weekend Syllabi - An annual event for dancers, musicians and callers

Ceilidh Dances - party dances from the UK for all skill levels

Bands I recommend for your event:

Forrest Carroll and Friends - Appalachian fiddle tunes
WB Reid and Bonnie Zhanow - old timey duo, they play a wide array of fiddle tunes

Phil and Vivian Williams - traditional Northwestern fiddle tunes,

The Rhythm Rollers - Traditional New England fiddle music for contra dancing

Red Dog - Old time string band