(VA) (Northern Virginia Bird Alliance) NVBA is partnering with Mason Neck State Park to host regular bird outings every fourth Saturday of the month from. Your guide for these events will be John Colpoys, an avid birder and experienced bird guide for NVBA. These events are free to attend and open to anyone! Registration is requested, as it helps us anticipate the number of attendees and communicate if needed. Please see our cancellation policy below.