Organizers of this month's Woodstock '94 and a competing quasi-reunion, "Bethel '94," are in the hole. A bad case of jitters caused by 100,000 unsold tickets led organizers of the 25th anniversary Woodstock to extend the sale period and loosen up on parking rules. And at Bethel -- planned for the same Aug. 13-14 weekend, but on the site of the original Woodstock -- the original organizer pulled out complaining the event was getting too commercial. He also left the show looking for a new angel. If Bethel's crew can land on their feet, the show will mark the first concert at Max Yasgur's famous farm since a half-million flocked to the big show in 1969.