I agree with Ty. Use of local terms or locations may be good for modelers from the area or close by, however for people from out of town or those going for the first time, clear and concise maps and instructions are invaluable. Motel listings and locations are very helpful as well. Nothing worse than getting to a city and having trouble finding the flying site.
Also, if a practice day is noted, post the times on the flier, and make sure someone is there to open the area if it is normally closed. Have gone many times to contests that advertise a practice day, only to have met with a closed site.
A fresh and nicely mowed field, if grass, is nice too. Pit area as well........ (Some do a nice job with the circle, but are a bit lax with mowing a pit area.) Not a complaint, just an observation that if done would make things a bit nicer.
All the other things listed are good, people, food , water, restroom, etc..
Larry