can I go from terminal 2E to Terminal 1 to meet up with the rest of my party so we can leave the airport together? and how long will it take? should I use the CDGVAL?
There is a train connection (RER B) between the different terminals. Assuming you gathered everything, it should take you about 15min to find it and travel through. See here the links to CDG accomodations and below an image that sums it up.