Something to ponder...

One of the days, a couple of prior weeks, received a mail from a colleague, requesting blood, as his father would be undergoing surgery. This mail, was posted on to the official work group [consisting of 90+ people], added to this, this colleague is quite a popular figure in the group. So, one can expect atleast 30+ people would have volunteered.
But, the outcome was a revelation.... Only 4 people [including him] were the donors who volunteered. This is the saddest part. The hospital was not looking for exact blood match donors, but wanted to replenish the used stock with (any) donor's group. Not sure of what the stigma could be for the volunteers but, so is the reality.

If so is the state for a well-connected person in the group then pondering about others.

Below is the list of places where one can reach out for people.
India Blood Donors [looks like a dead link]
Lion's Blood Line

Well, though a lot has written on blood donating, wikipedia has one such a informative link.