I think others have a better name for it but basically it's were you arrive and end. It's made up of the baggage tents where you can leave your bag with post race items you want to have on hand (like sweats if it's cold i guess i haven't left a bag yet). there are the tents for your support team to meet you at. like at the DL Half the WISH team met at the W tent (i however went to the medical tent because i'm paranoid LOL) oh yeah, there is a medical tent LOL a refreshment tent that at WDW after you do finish you get the chip cut, the foil tossed at ya and then the medal next you get your photo taken if you wish and onto the food tent that you walk thru to get to the baggages tents at least I think that was the set up.
i believe some tents were for the sponsers and Disney had a trailer (think refreshment long trail thingy) for merchandise (in DL I think they used a tent)
Oh i do recall the information tent since we went there in 2005 to ask a question.
therefore i refer to it as tent city. then there is port-a-city LOL the area where the port-a-potties are all lined up. again i think someone had a better name for that area.
in DL it was rather kewl because our resort room overlooked the staging/tent area and we could see the finish line from our window. at WDW it's in Epcot's parking lot. It was neat getting up in the morning and looking out at the finish and knowing we'd be crossing it soon.
Happy training!!!