I saw that last year there were 4 or 5 challengers after Paris. So here's my suggestions for challengers this year (main things are: most points and best field):
03.11 - Bratislava
10.11 - Dnepropetrovsk (week of Shanghai)
17.11 - Helsinki
24.11 - Lima
Those who participate in Shanghai cannot play in Dnepropetrovsk (16 players will be defined on Sunday, all other can play in Ukraine).
Challengers, which don't have reliable livescores, will have deadline 10 minutes after the first match scheduled.
Any questions ? Managers needed, btw