International Migratory Bird Day (IMBD) officially takes place on the second Saturday in May in the U.S. and Canada and in October in Mexico, Central and South America, and the Caribbean each year.
In celebration of International Migratory Bird Day, a wide range of birding festivals occur within national wildlife refuges each spring.
The following is a list of popular festivals that are coming up in April and May, 2011:
San Diego Bird Festival
Thursday, March 3 - Sunday, March 6, San Diego, California
Attwater Prairie Chicken Refuge Birding Festival
Saturday, April 9 and Sunday, April 10, 7 a.m. to 1 p.m. — Attwater Prairie Chicken National Wildlife Refuge, Texas
Santee Birding and Nature Festival
Friday, April 29 - Sunday, May 1 — Santee National Wildlife Refuge, South Carolina
Balcones Songbird Festival
Friday, April 29 - Monday, May 2 — Balcones Canyonlands National Wildlife Refuge, Texas
Kachemak Bay Shorebird Festival
Thursday, May 5 - Sunday, May 8, Homer, Alaska
Biggest Week in American Birding
Thursday, May 5 - Sunday, May 15 - field trips to Ottawa National Wildlife Refuge, Ohio
Great Dismal Swamp National Wildlife Refuge
Thursday, May 12 - Saturday, May 14, Great Dismal Swamp National Wildlife Refuge, Virginia
Tualatin River Bird Festival
Friday, May 13 - Sunday, May 15 - Tualatin River National Wildlife Refuge, Oregon
Great Salt Lake Bird Festival
Thursday, May 12 - Monday, May 16 - Farmington, Utah
Celebrate Birds for International Migratory Bird Day
Saturday, May 14, 9 a.m. to noon - Toppenish National Wildlife Refuge, Washington, and McNary National Wildlife Refuge, Washington
Alaska Birding Festival
Thursday, May 19 - Sunday, May 22 - Kenai National Wildlife Refuge, Alaska
Detroit Lakes Festival of Birds
Thursday, May 19 - Sunday, May 22 — Detroit Lakes, Minnesota