voluntarism ( def 2 ).
the policy or practice of volunteering one's time or talents for charitable, educational, or other worthwhile activities, especially in one's community.

1835–45; volunteer + -ism

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World English Dictionary
volunteerism (ˌvɒlənˈtɪərɪzəm)
the principle of donating time and energy for the benefit of other people in the community as a social responsibility rather than for any financial reward

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Example sentences
Looking around the office, he attempted to divine who could help the company
  move from volunteerism to profitability.
All community partners will benefit as a shared destiny is forged through
  volunteerism and community service.
It is also a city of civic engagement with more volunteerism than any city in
  the country.
Community involvement and volunteerism should increase voluntarily.
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