It appears the May Roanoke and Greensboro shows are still a go.
“Due to an unforeseen and urgent health concern that requires immediate attention, we have been forced to reschedule and unfortunately cancel a few select shows on the upcoming tour with Willie Nelson. A list of the affected shows, along with makeup dates and ticket refund/exchange policies are listed below. We sincerely apologize for any inconvenience.”
May 1 – Murray, KY – CFSB Center – RESCHEDULED BELOW
May 2 – Atlanta, GA – Chastain Park Amphitheatre – RESCHEDULED BELOW
May 3 – Knoxville, TN – Thompson-Boling Arena – RESCHEDULED BELOW
May 4 – Cary, NC – Koka Booth Amphitheatre – RESCHEDULED BELOW
May 6 – St. Augustine, FL – St. Augustine Amphitheatre – RESCHEDULED BELOW
May 17 – Birmingham, AL – BJCC – CANCELLED
May 18 – Augusta, GA – James Brown Arena – CANCELLED
http://alisonkrauss.com/news/alison-krauss-willie-nelson-tour-update/