Definitely take time to explain and reinforce the basic safety rules.
Even better in a crowd of novices - after the basic safety - give a demonstration of each weapon you've brought, explaining its action, proper operation, safeties and cautions. Fire it yourself, then walk each person through firing a string through it. Only after you've made sure each newb has adequately operated the weapon, should you take your eyes off them with it.
Even better / safer idea is keeping at least a ration of one experienced shooter to two hot weapons / newb shooters, AFTER the basic instruction is completed. A larger number of people to keep an eye one, or allowing one novice to shoot while another consumes all your time and attention is a recipe for disaster.
It's a potentially lethal situation. Have fun, but keep this in mind at all times.