Tres Rios Nature Festival is a two-day event held annually n the spring. This FREE outdoor festival showcases the rich diversity of wildlife habitat, history and culture of the Gila River drainage, which is made up of the Gila, Salt and Agua Fria Rivers. From guided bird tours, canoeing on the river, archery, fishing and learning about Southwest wildlife, there is something for everyone during the best time of year to enjoy the Arizona weather, and it's all FREE! Take I-10 to Avondale Blvd (115th Ave) and head south. Just before you get to the racetrack you will see the signs for the free parking.
Here is my Valley Views interview with Christina Underhill from Avondale Parks and Rec, and Jana Randall from REI, sponsor of this year's festival.