Now, let’s welcome Dr. Lee to give us a speech.

[kadioguy]

(My original sentence)

Host: Now, let’s welcome Dr. Lee to give us a speech.

---------
I think the 'welcome' isn't be used correctly. ("Welcome someone to do something" seems incorrect.)

How can I rewrite it? How about this?

Host: Dr. Lee will give us a speech. Now, let's give a warm welcome to him.

 

[Rover_KE]

You don't need to mention the speech. Presumably, that's what the assembled crowd have come to hear, rather than a poetry reading or a song recital. Just welcome him/her.

 

[kadioguy]

You don't need to mention the speech. Presumably, that's what the assembled crowd have come to hear, rather than a poetry reading or a song recital. Just welcome him/her.

Thank you. Rover_KE

How would you say it, instead of the following blue part? How about this?

Today he'll share some insight on his exploration of the God Particle. Let’s welcome him.

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【Reported by Jing-ya Su, Tamkang Times】On December 24th in the Science Building, the Department of Physics held a lecture titled, “What do we know about the God Particle?” Distinguished Researcher from the Institute of Physics Academia Sinica, Shih Chang Lee, gave a lecture to over 50 participants, revealing the secrets of the mysterious “God Particle.”Shih Chang Lee has continually received awards for outstanding achievements since 1986 for both scientific and academic research.

He was introduced by the Director of the Physics Department, Zicong Zhou, who stated, “Shih Chang Lee’s expertise revolves around the God particle. He’s worked together with one of the largest and most respect scientific research centers in the world, the European Organization for Nuclear Research. Today let’s welcome him to share some insight on his exploration of the God Particle.”

https://tkutimes.tku.edu.tw/edtl.aspx?no=29161

 

[Tdol]

How about:

Host: Now, let’s welcome Dr. Lee, who's here to share his insights from his exploration of the God Particle.