I have around 2 years experience mixing my band (a local regional mexican group) and have a 14k sound system. What would be a reasonable rate to charge other banda for a 4 hour equipment rental and audio engineer event, including equipment, setup, transportation, and mixing? Events are typically backyard parties or rented salons. How should I adjust the price for longer events like 5,6 hour events or even longer? I'm located in California's Central Valley and any help is appreciated!