the examples of opening and closing speech:
good morning/afternoon ladies and gentlemen. it is my honor and previlage to conduct this special (name of the occasion). and now i am in here to talk about my (your speech)
thank you for your wonderful patience. and thats all for today. thank you for listening.
(that is the way of speech for me, but its your own decision if you want to add something : ) )
We need to stay calm and stay alert as always and always wash hands before and after eating and using the toilet
We need to understand all of this because this things needed to save lives