In Formal letters^x, Invitations^x, Universities^x

Hi, I would like to ask you question on how to write a formal letter. Suppose you want to extend someone an invitation in order to attend a conference and you must specify the dates when the conferencce will be held. Would you consider correct the following sentence? Dear Professor XYZ, in the...

Dear Members, I would like to ask you question on how to write a formal letter. Suppose you want to extend someone an invitation in order to attend a conference and you must specify the dates when the conferencce will be held. Would you consider correct the following sentence? Dear Professor...