[Jeffrafa]

Outlet convenience outside the pits will depend on the event and venue, but I would not count on it. You may be able to find a place to plugin temporarily outside the stands, but running an extension cord across walkways and stairs to get to where you are seated in the stands could present a serious trip hazard in busy areas.

For our scouting setup, we have used older robot batteries (not good enough for competition) to power laptops, tablets, and for recharging phones. We have a kit built up that includes fuses, an inverter, and 12v DC automotive outlets. I would suggest you look into a similar off-grid setup.

In the PNW district, there is a blanket rule to never plug into any outlets in the gym. If anything is found plugged in (cell phones, etc), they are confiscated until the end of the day. The intent is to make sure no circuits shared with supplying the field power are overloaded. In many cases this is overkill, but some older schools have very limited power to school gyms, and the last thing they want is the field losing power due to a tripped circuit.