Simple English translation, experts can help check it, thank you!

1. The weather was very good that day

It was sunny that day. Okay.

Or The weather's fine that day.

2. The company is so far away from my dorm that, I have to spend a lot of time on the road.

I had (talking about general situations, just use the present tense, change it to have) to spend much time on the way.

3. There will be a charity event on "Care for Stray Animals" next Sunday.

There will be a public activity about "saving homeless animals" on(on remove) next sunday.

4.All of the hotels had no room.(Do you want the room here? Add s?)

I think it is better to change this sentence like this, All of the hotels had no available rooms

5. If he does this, he is a good boss.

He will be a good boss if he makes it.

6. You lack experience, what do you think?

How do you see /think of your inexperience?

Yes, there is a gap between me and your company, but I believe that in a short time, I will meet your company's requirements.

well, there is a gap between your company and I, but I believe I will be qualified for the job very soon