I’m plotting to visit on the 8th of October. Already very excited.
RCT have a look at the Transport For London web site for details of which bits of the tube network are being upgraded on Saturday 8th.
Also remember you can get a 1 day travel card at stansted train station instead of buying rail tickets on the Ryanair flight.
Might even be worth checking out the Trainline web site to see if you can buy your ticket early and collect it from one of the ticket machines at the station.