The speech maker=>lecturer, speaker, spokesman
the different between=> the difference between
Information
May I have your attention ,please? This afternoon we will have a speech in the school meeting room,which is in the west of the library .Also the time is 1:30pm The speaker is Ms Zhang ,who is our school English teacher . She has been studying in the USfor four years .So she will speak about some of the differences between China and the US .And when you go there ,you will be able to talk with Ms Zhang or other. So I hope to see you in the meeting room on time.Thank you.
WE don't usually say "that's all at the end of our writing or speech.