Pack Rat Day is celebrated on May 17, 2018. A pack rat is a who engages in compulsive hoarding and on Pack Rat Day is a chance to celebrate them, because they may use the collected items someday. The day is also an opportunity for hoarders to reflect their acquisitiveness - are the collected things really needed?
Packratting has been associated with health risks, impaired functioning, economic burden, and adverse effects on friends and family members. When clinically significant enough to impair functioning, hoarding can prevent typical uses of space so as to limit activities such as cooking, cleaning, moving through the house, and sleeping. It can also be dangerous if it puts the individual or others at risk from fire, falling, poor sanitation, and other health concerns. (With material from: Wikipedia)