Be Kind to Animals Week – May 4-10
In 1915, the American Humane Association organized this week to celebrate the relationships we have with animals, particularly our pets.

American Humane Association
Humane Society of Fairfax County
Washington Humane Society

Free Comic Book Day – May 3, 2008 (first Saturday in May)
The first Saturday in May has been designated Free Comic Book Day. Participating comic book stores worldwide will give away a free comic book(s) to anyone coming into their stores. This day is designed to bring attention to this original American art form and to bring new readers into independent comic book stores.

Freecomicbookday.com
Wikipedia

Get Caught Reading Month
“Get Caught Reading Month” is sponsored by the Association of American Publishers. The purpose of this event is to remind people of all ages how much fun it is to read.

Association American Publishers
readingrocket.org

National Hamburger Month
May was first proclaimed National Hamburger Month by the White Castle restaurant chain, which claims to be the first fast food hamburger restaurant, as a publicity effort. You can find out who invented the hamburger, how it got its name, and how it became the most popular American sandwich by checking out these websites. You can also find new recipes or invent your own hamburger!

North Dakota State University
Whitecastle.com
History of Hamburgers
Seriouseats.com
Cattlemen's Beef Board and National Cattlemen's Beef Association
Kids Web Japan

National Physical Fitness and Sports Month
Organized by the President’s Council on Physical Fitness an Sports to encourage organizations, including schools, to promote fitness activities and programs.
President’s Challenge.

Presidentschallenge.org (kids)
Presidentschallenge.org (teens)
Presidentschallenge.org (older adults)
Kidnetic.com
The President's Council on Physical Fitness and Sports

National Bike Month
National Bike Month is sponsored by the National Bike League.

Bibikeleague.org
Boyslife.org
Wikihow.com
highsmith.com

Mother Goose Day – May 1
Mother Goose Day was established in 1987 by Gloria Delamar as a way to remember and appreciate the old nursery rhymes taught to children. The motto for this special celebration is “Either alone or in sharing, read childhood nursery favorites and feel the warmth of Mother Goose’s embrace.

Mother Goose Society celebrates Mother Goose Day
Mother Goose (Wikipedia entry)

National Backyard Games Week – May 19-26
Celebrate the unofficial start of summer by encouraging physical fitness and social interaction through backyard games with family and friends.

Patch Products
iParenting, LLC.
Wondertime: Backyard Games