A mobile participation platform enables a wireless network operator or third party to solicit response data related to a specific time and location specific event by signaling multiple mobile device users that meet predefined qualifications. The qualifications include presence at the specific location at the specific time, and may include other characteristics, such as prior consent to receive solicitations, and particular device type or data collection functionality. The platform locates mobile devices that may qualify for participation, and generates and transmits a solicitation. Mobile devices receiving the solicitation may activate a participation client to acknowledge the solicitation and to contribute by submitting the requested response data, which may include photos, text, sensor data, audio, video and the like. The qualifications are verified, the response data is validated, and anonymity and privacy are maintained by associating the mobile device and other pertinent non-identifying information with an encrypted identifier.