Although Mohamed speaks English, being able to speak some French and learning some Arabic phrases will help you communicate with all the team.
Pack lightly - you need very little. I wore the same trousers and top in the day and then changed into the same thermals, base layer, trek pants, jacket and hat/gloves/etc in the night. We were lucky with the weather - very little wind and no rain, but everyone agreed we needed much less stuff than we thought.
Bring sweets to share (and try to make sure they are halal for the guides). There was plenty of food, but it is plain, basic fare. Biscuit break was much anticpated and when there were sweets to share as well, everyone's mood lifted. Breakfast is the amazing desert bread (cooked in ashes in the sand) and jam or cheese triangles. We thought that some Marmite or peanut butter would be nice. If you can bring some, your fellow travellers will love you!
Singing songs around the campfire was a highlight. Come ready to sing, especially songs with actions that everyone can join in with (whether they know English or not). Jokes, I Spy, charades - all brilliant for pasing the time and breaking down barriers.
If the weather is nice, sleep outside. Falling asleep looking at the stars is a lovely experience and if you're well wrapped, then you should be comfortable.