Paris Versailles LeGrande Race in Sept. 2018?

I am staying at the Les Tournelles 30 rue de Turenne in Paris & participating in the 16K race on Sept. 23rd, 2018.

Any tips on getting to & from the race start & finish? Which train connections are the best & an estimate of how much time will I need to allow before the race? Thanks in advance for your advice!! Mona