(Portland, OR) -- Summer is a difficult time for organizations that take blood donations. Vacations and other activities keep people away from donation centers. The Red Cross has collected 50-thousand fewer blood donations than needed over the last two months. To increase donations, the Red Cross is working with Discovery for the 35th anniversary of Shark Week. Starting Wednesday, donors will be entered for a chance to win a three-night New York trip for two with a private shark dive adventure at Long Island Aquarium. Starting July 17th, donors will also get a Shark Week T-shirt. You can make an appointment to donate at RedCrossBlood-dot-org.