Pre Mission Planning
The question of premission planning has come up several times. For the purposes of planning a mission, you can assume you know who else is hired once the mission has been scheduled OOC.
The message you receive about the meeting info with the Johnson is assumed to include a means of contacting the others in your party.
You can talk amongst yourselves all you want without including a GM. The only time you need to talk to the GM before the mission is if you want to do background research on the job or buy gear which is not covered in the Buying Goods section.