introdution by
The person who introduces a speaker is commonly referred to as the "emcee" or "master of ceremonies." Their role is to welcome the audience, provide background information on the speaker, and set the tone for the event.
Speaker
A native English speaker.
Jsjsos
Guest of honor
Guest
An orator or eloquent speaker.
The visiting person is the guest, while the person doing the entertaining is the host.
A Client, Customer,Guest or Patron?
A person who introduces another individual is commonly referred to as an "introducer." This role can also be described as a "facilitator" in social contexts, especially when the introduction is meant to foster connections or collaborations. In formal settings, the introducer may be called a "host" or "emcee."
I am sure they are called a presenter as well because they are (presenting) the programme which is coming on next. Hipprocker.
A person who talks nonsense can be called an eccentric, a babbling fool, or a gibberish speaker.