Conversation so far:
When did John Butler's solo career begin?
On 29 June, Butler gave a live solo performance at Twist and Shout Records in Denver, Colorado, which was released in January 2008 as an eight-track EP.
Did John Butler play anywhere else besides Twist and Shout Records in Denver, Colorado?
John Butler played at the Montreal Jazz Festival.
Where else did John Butler play besides the Montreal Jazz Festival?
John Butler played at the Rothbury Music Festival in Michigan and The Mile High Music Festival in Denver

Question: Did he play internationally?
Self-contained rewrite: Did John Butler play internationally after playing at the Rothbury Music Festival in Michigan and The Mile High Music Festival in Denver?