You are invited to a party:
Hello everyone, it is my great honor to be invited to be part of this (event)......

You are the guest of honor.
:Hello everyone, I’d like to thank you all of you who
has come together to organize this(event)....

3. You are hosting a party.
:Hello everyone, it is my great honor to be invited to be part of this (event)............today/tonight.

You are introducing an important person who is going to give a speech.
:Hello everyone, and pleased to have the opportunity to introduce you to …….who will give the lecture on…….
Please Mr./Mrs./Sir/Madam.

You invite someone to deliver a speech.
:I would like Mr./Mrs./Sir/Madam……to deliver the speech.

You are invited to open an event…
:It has been my great pleasure to preside over the opening of the event………today.

Public speech as an Ambassador

I must have done something good in the past to have the honor of being the Ambassador to this great Kingdom…

Requesting assistance during hard times(personal or national)

Providing blessing to others