We provide 1 site survey free of charge with a tent rental.  This allows us to become familiarized with the site before the event occurs.  We will establish exactly where the tent will be erected, if there are any obstacles, if the power source is adequate, and if any special tools are needed.  We like to schedule a site check weeks in advance of the event.  Not all tent settings require a site check, but they do tend to provide "peace of mind" for the customer.