Instead of writing more PMs with Guillaume/Sami, I just ask here (and on the French forum in some weeks if it helps):
I'd like to catch the same train all people from UK/NED take at Montparnasse. Unfortunately I can't arrive at Gare du Nord earlier than 12:05pm. Understandably you'll need more time to get the metro with a bigger crowd you are partly responsible for, Sami. I don't request anyone to wait too long for me, but I want to know as soon as possible which train from Montparnasse to Le Mans you are looking for so that I can figure out if I'm able to join this one or not.
You said usually around 1pm...I've never been in Paris and don't know how quickly I could reach the metro. What I've checked though, is:
- metro station
Gare du Nord is directly in front of the railway station exit (more than 10 min to reach?)
- metro train M4 leaves every 5 minutes there
- travel to metro station
Montparnasse Bienvenüe takes 25 minutes
- walk to
Gare Montparnasse (more than 15 minutes?)
Assuming it's very crowded everywhere (likely in such a capital, I guess), I should reach any train after 1:30pm, probably a lot sooner, but to be on the safe side. Is this unrealistic? Then tell me!
In case the "main group" heads for the metro before I arrive, I'd still like to spend this time not alone in Paris, if possible (@ Guilherme: Do you already know more about your schedule?).
By the way: Who takes care of the internal tickets? Sami told me it was Florian Valandina the last couple of years, which means he waited at the train station, or what? More information appreciated

.
Matthias