Lake Mary Ann is an outdoor recreation and event-permit location near Tennant Creek, administered through Barkly Regional Council. The council lists a specific Lake Mary Ann venue booking form alongside other parks and reserves, showing that organised outdoor use requires enquiry and approval. This is not an enclosed hall with a kitchen, fixed seating or indoor presentation equipment. Event organisers should check swimming and water-edge safety, weather, road access, power, shade, toilets and any alcohol or amplified-noise requirements directly with council. The government venue page does not identify a precise event entrance address or a single visitor capacity.