It all depends on where you are, the sound person and the equipment they have. For shows where I don't take an amp I take my basses, effects, and active DI and cables to hook it all up and an xlr cable to hook up to their system or snake. Many places will already have a DI for you to use but just in case. Remember that you are at the will of the sound person so be friendly and cooperative. I do often have a small bass amp in the car in case the monitoring situation is not all the great.