http://blog.olacabs.com/share-life-donate-blood/

Save life, donate blood
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World Blood Donor Day is celebrated every year in many countries around the world on 14th of June. Blood donors are the key role players on this day as they donate the life-saving gift of blood to those need it. This World Blood Donor’s day – share your gift and as a token of appreciation we’re giving a free ride to anyone who has done this noble deed.
This is what you have to do:
Show your invoice at the time of entry
Get a free ride voucher after you’ve donated your blood.