NYC City Parks offers the volunteer opportunities:

Volunteer in Your Neighborhood
Get connected to a network of people and organizations who need your help!

Volunteer for SummerStage
Do you possess a boundless supply of enthusiasm, a willingness to meet new people and a desire to contribute to the cultural enrichment of New Yorkers? If so, SummerStage wants you to join our volunteer team! Volunteers are the public face of SummerStage, performing a wide variety of tasks at all of our performances.

For more information: www.cityparksfoundation.org/volunteer