What about a game of Chinese Whispers. This can be very funny but also pushes home the message that if you want something done properly you must write it down and make it formal. Take three items to be completed (a paragraph each with simple technical information) and read these out to the first person. Introduce the second person so that the first person can tell them what they need to do (without notes), then a third person and so on. By the time you get to person 3 or 4 you will be in stitches laughing at how the tasks have been passed on, but it will stress the importance of taking a few minutes to make a formal note.

This will also make your H&S awareness a lot of fun and people remember fun better than they remember droning.

I did an safety day with a group of 25 apprentices for a HGV vehicle repair company age range(18-23) (tough crowd) all technicians so all learn by using their hands, death by power point was not an option. So the morning focused on all the various PPE they had with games associated with each item and why they needed to use them so for example performing a relay race with their hands impaired to simulate what life would be like if they didn't wear their cut resistant gloves and took a finger or two off they had to button a shirt up put on a tie and fold a letter and put in the envelope all with just their thumb and little fingers, vision games blind folding one eye so depth perception is lost games like that. Then the afternoon they had to build elastic band racing car / truck out of scrap recycling in teams, using all their PPE, when they would use it in real life (for example goggles, gloves and mask when painting the trucks) Ear defenders when fixing on the wheels etc they had great fun picking team names, logos, colours etc and then we had a race at the end.

With awards for best and correct use of PPE, Best team name, fastest car, etc and gave out trophies at the end.

PPE compliance improved massively and it gave the youngsters the confidence to push the message with their older colleagues showing an improvement across the age range as a result.

I did a similar thing, different topics but loads of games with a group of 50yrs + managers who also loved it and learned a lot.

So my advice is keep it fun, we are all kids at heart. I would have them out their seats as much as possible with lots of communication games so maybe make a maze blind fold one person while other person gives instructions. Or carrying out a simple task following instructions whilst blind folded.

Treasure hunt with good or bad prizes - following partial instructions (make it so that they will land up at the bad prize) - demonstrating what can go wrong if only some information gets through.

Catch phrase could also be good because you only have some of the information as the pictures get revealed so again emphases on importance of the full picture being communicated.

Just a few ideas, Good Luck