The following are some ideas for setting up a medical display/livig history event. Begin from top down, with your equipment.
For example start with your helmet. Explain how there really wasn't any "regulation" medic helmets. Some medics didn't have any red crosses on their helmets; others would put one in the front, or one on each side. If they were really paranoid they would have a red cross on each 4 sides and one on top (just in case!). If you have a show liner in your helmet, pull it out and explain how they would decorate up the liner with all sorts of things for parades (not that it has much to do with being a medic but its interesting).
Move on to your Geneva Convention brassard (arm band) and ID card. Explain why a medic was issued an ID card. How by Geneva Convention medics were not typically to be held as prisoner, and that there are documented cases where we returned German medics, and they returned some of ours. Make note that being a medic in the Pacific theatre was worse that being a regular GI, as the Japanese purposefully targeted aid-men in battle. Most medics in the Pacific did not wear red crosses, or they did they dyed their brassards green as not to stand out as much.
Move on to your suspenders, medic bags and contents, etc. If you have one, show them a soldier's standard first aid tin with bandage and sulfanilamide. Explain how this was about all they had to stave off infection (as penicillin wasn't available until late-war).
Once you're done with your uniform, move on to general medic topics, and how medics were often highly revered by GIs. For instance here is a good quote from http://legacyofheroes.aaos.org/:
"The first angel of mercy that the wounded soldier sees is the medic, and I think the greatest heroes during any war are the medics, 'cause they will go to the aid of a soldier regardless of what the circumstances are. And oftentimes, if they're still under fire, they'll protect the soldier with their own body to save his life. So I would rate them as the greatest heroes of wartime."
Explain how a soldier's job was to fight until he could fight no more, or the war was done. But a medic's job was to clean up one man after another, again and again, day after day...
Nowhere is the suffering of war more apparent, than through the eyes of a medic.