Here's a list of art fairs happening all over the world during the month of May:

PULSE New York
125 West 18th Street, Metropolitan Pavilion 
PULSE is the leading US art fair dedicated solely to contemporary art.
May 9 - 12, 2013

Frieze Art Fair | New York
Randall’s Island Park 
Situated on Randall‘s Island, Manhattan, Frieze New York includes 180 of the world‘s leading contemporary galleries
May 10 - 13, 2013

artMRKT San Francisco
Concourse Exhibition Center, 620 7th Street at Brannan 
The Bay Area’s premier contemporary and modern art fair with an Opening Night Preview benefitting the Fine Arts Museums of San Francisco
May 16 - 19, 2013

Art Basel in Hong Kong
6/F Luk Kwok Centre, 72 Gloucester Road, Wan Chai 
The debut show will present more than 250 of the leading galleries from Asia, Europe, the Americas and the rest of the world
May 23 - 26, 2013

MadridFoto
C/ San Joaquín 12, 3ºD 
MadridFoto is an international photography fair that hosts emerging and contemporary galleries
May 23 - 26, 2013