I went to two Endfests in the 90's. They were alternative music festivals hosted by a local radio station (WENZ) in Cleveland. One was at the Geauga County Fairgrounds in 1994, and one at Blossom Music Center in 1993. I wish I could recall all of the bands at each...but here's what I recall from those:
The Jayhawks, Violent Femmes, L7, Gigolo Aunts, Candlebox, The Clarks, The Odds, Tears for Fears, Jellyfish.
Both concerts were about 8 hours long, so I'm sure I'm missing some bands that I've later heard of....I think Sarah McLachlan may have been at the 1993 concert.