Wow that was a near miss (the section where SOTM is located will reopen a week before the event)! We are talking here about the suburban metro (RER A) that is the most convenient way of going from Paris (or from the Disney area hotels) to the conference venue.
while I’m at it, here are tips for using public transportation here in the Paris area:
- there are three different kinds of one-trip tickets: all metros and local trains, all buses and trams, and trips to/from airports. Yes you must pay two different tickets for a bus+metro trip.
- you must buy a pass to put your tickets on (costs 2€) OR you can use your phone with the free Ile-de-France Mobility app. I recommend using the app at least when arriving from the airport or train station, so as to avoid long lines.
- you can also load combined tickets on your passes or phones but I never have need for them and you’d better check the app or web site