There are different stages in formal greeting. You could use the following -
1) Good morning one and all.
2) Good morning ladies and gentlemen.
3) Good morning to all the respected dignitaries present here.
4) Good morning to the (Chairman), (President),(Vice president) and all my fellow colleagues. (The bracket is for the guests present in the meeting)
P.S. If you need help to improvise your English for free, feel free to text me.