I just heard about this from my brother. And I found the listing on the Jackson Community Foundation website:

Monday June 4
7:00 p.m.
"Open a Poem with Billy Collins"
to be determined
Billy Collins, U.S. Poet Laureate 2001-2003, will deliver a free, public poetry reading with commentary followed by Q&A and a book signing.
Cost: FREE
Teton County Library Foundation
Contact: Pauline Towers-Dykeman - 307-733-2164 x217