AmericanBluesScene.com has the information about the cancelled Portland date.
UPDATE: Jambands.com is reporting that Allman checked into a hospital on Monday.
Online ticket purchasers: If you purchased Gregg Allman tickets online through the zoo’s website, a full refund will automatically be issued to the purchaser of record. An email with this information will be sent to everyone who purchased a ticket online. Please allow up to 2 weeks for processing.
Zoo gate ticket purchasers: If you purchased Gregg Allman tickets at the zoo, please return your tickets to any WPZ ticket window during business hours (9:30 a.m. – 6:00 p.m.) for a full refund. For the fastest refund, please bring both your hard stock tickets and receipt. If you return tickets with no receipt you will be issued a check. Please allow up to 2 weeks for processing.
Unfortunately, tickets purchased through a third party are not able to be refunded.
Zoo concert staff will be on hand tomorrow (7/2) until 7:00 p.m. to assist anyone who has questions.
Any additional questions should be directed to firstname.lastname@example.org