What's your the most memorable moment?

Better say: What's your most memorable moment? (*remove "the" ) 

I prepared five clothes sets, but she selected only one set.

Better say: I prepared five sets of clothes, but she selected only one. 

All kids run around everywhere. --**Correct sentence~ ^^ 

I need to find any pavilion to sit my family.

Better say: I need to find any pavilion to sit with my family.

The president hosted this workshop, but he didn't participate. --**Correct sentence~ ^^ 

She made me an unforgettable memory at the amusement park. 

Better say: She gave me an unforgettable experience at the amusement park.

Don't worry a lot. I will work out. --**Correct sentence~ ^^ 

My team member haven't ever been participating in team-building activity.

Better say: My team members have never participated in a team-building activity.

I want to do something to develope my community. 

Better say: I want to do something to help my neighborhood.

He considers to bond between parents and children. --**Correct sentence~ ^^ 

That's a good cause to paly games. **Correct sentence, however, becareful with the spelling of "play"