Tickets for the massive Woodstock 50 festival celebration in Watkins Glen, NY, were supposed to go on sale this Monday, April 22, but now organizers of the event, which honors the 50th anniversary of the original legendary gathering, have announced the on-sale date is postponed.

As Billboard reports, representatives of the festival sent an email to agents of the artists set to play Woodstock 50 on Friday that conveyed the postponement, reading, “There is currently a hold on the Woodstock 50 on-sale date. We are waiting on an official press statement from Woodstock 50 regarding updated announce, ticket pricing, and overall festival information. We will get this information to you as soon as we receive it.”

The news comes after The Black Keys already canceled their headlining appearance at Woodstock 50 and continues to spur worries of a full cancellation of the ambitious festival. Michael Lang, one of the events promoters who was also a key factor in the original Woodstock, spoke to Billboard about the concerns, saying, “Woodstock is a phenomenon that for fifty years has drawn attention to its principles and also the rumors that can be attached to that attention,” and calling the cancellation talk “just more rumors.”

Billboard also contacted representatives for multiple Woodstock 50 acts, who confirm that their clients have already received their performance deposits, though one unnamed agent notes that the on-sale postponement likely points to issues with investors or the venue, Watkins Glen International Speedway. “No one knows what the hell is going on but there is clearly a problem,” the agent says.

All Woodstock 50 information can be found at the festival’s website.