I don't have advice about the conditioning or actual performance part of racing, but I can probably answer a lot of your questions about the logistics of the event.
When the race packet comes, pore over every detail. If you elect to be her " ride down", you'll need to know what that packet tells you. You may not understand < why> things are the way they are, please ask ( beforehand) if you don't.
Every front line employee of the MWAR and MW State Park gets every scrap and bit of policy and procedure that goes to every participant.
The Sherman Adams summit building atop Mt Washington has a maximum capacity of 250 people. Summit parking is limited to @ 300 cars under the best of circumstances. After summit lots are filled, parking goes down the road as Space Available, and that can make a long road walk for a stressed competitor if their ride is at Cow Pasture ( six mile rather than 7.8)
When the Sherman Adams building is full ( yes State Park staff man the entrance/exit and use counters to keep track of entrances and exits) no-one is allowed in until someone comes out. There will be a wait line for entrance to the building. There will be wait lines for bathrooms ( once one even gets inside) and there will be wait lines for food/beverage.
Take heed, that is the real deal.
The more efficiently racers carpool the available seats down, and limit the number of spectators on top, the easier it is for the ALL the competitors in the end.
It is a very difficult venue from every aspect.
Breeze