May Weekly Events
Unless otherwise stated, these are generally observed in the US only.
Occasion Sponsor
First Full Week
Arson Awareness Week US Fire Administration
Be Kind to Animals Week American Humane Society
Goodwill Industries Week    Goodwill Industries International
National Family Week numerous churches
National Pet Week  American Veterinary Medical Assoc.
National Postcard Week Postcard Historical Society
PTA Teacher Appreciation Week National PTA
Small Business Week Small Business Administration
Week of the Classroom Teacher
(thanks Gina)		 Association for Childhood Education International (ACEI)
Second Week
Nurses Week  American Nurses Assoc.
Hospital Week (click here for more info).
MCS Awareness Week ECHO (Ecological Health Organization, Inc) 
National Tourism Week  National Travel & Tourism Awareness Council
National Herb Week   International Herb Growers & Marketers Assoc.
National Historic Preservation Week National Trust for Historic Preservation
Third Week
Alcohol & Other Drug-Related Birth Defects Week National Council on Alcoholism & Drug Dependence Inc
Canadian Immunization Awareness Week CIAP
Emergency Medical Services Week (click here for more info)
Hurricane Awareness Week National Hurricane Center
National Bike Week League of American Bicyclists
National Police Week  American Police Hall of Fame Museum
National Transportation Week  Presidential Proclamation
Medical Transcriptionist Week (click here for more info)
World Trade Week Presidential Proclamation
National Salvation Army Week Salvation Army
Nursing Home Week (click here for more info)