Indoor tournaments:
Is the field turf or a gym floor?
If turf, are spikes allowed?
Are there sidelines or board walls?
If sidelines, kick or throw-ins to restart?
Any other tournament specific rules I can educate my kids on?  (IE goalies can't throw ball over mid field, etc)
Is there a dressing room to change in, or is it just bathroom space?
Do spectators bring folding chairs or do they watch from whatever built in seating there is?

Outdoor tournaments:
Any other tournament specific age-group rules I should educate my kids on?

All tournaments:
What is the GPS friendly address of the venue?
What documentation is necessary for both players and coaches?
What is the substitution procedure?