Please note: It would be wise to give a few days leeway either side for travel. Especially coming back - don't book your flights home the day after the finish party. You need to factor in getting to Lima from Atalaya. We would highly advise giving a few days.
It may be a good idea to arrive in Ayacucho a bit earlier to get used to the altitude.
Get yourself to the start line in Ayacucho
Test driving & party
Finish line opens plus the finish party and prizegiving ceremony