party ofChildren's Day celebration / Children's Day party Children's Day celebration / Children's Day party

You can write "party' too, but "celebration" can be more suitable when talking about holidays. "Children's Day party" is also more natural to write than "party of Children's Day".

When I write down the title, I am wondering whether activity would be more suitable. When I write down the title, I am wondering whether activity would be more suitable.

Not sure what this means?

The event which Igame that I was in charge of was called "blow the ball through the bowls". The game that I was in charge of was called "blow the ball through the bowls".

Better to write "game" than "event" here!

TIn the game, there weare five china bowls full of water, with a ping- pong ball is on onefloating on top of the first bowl. In the game, there are five china bowls full of water, with a ping pong ball floating on top of the first bowl.

No need for "-" in "ping pong". Also, I corrected based on how I imagined the game to work, not sure if correct. It is good to be more specific about how the game is set up!

The player needs to blow ithe ball from one bowl to another. The player needs to blow the ball from one bowl to another.

If someone wants to win a reward, he/ or she must blow the ball through 2 bowl, then the moretwo or more bowls. The more bowls, the better. If someone wants to win a reward, he or she must blow the ball through two or more bowls. The more bowls, the better.

At the beginning, I had a try, and it was not hard. At the beginning, I had a try, and it was not hard.

ButHowever, when other students tried at their first time, most of them failed their first time. However, when other students tried, most of them failed their first time.

Then several boys did the jobwere able to succeed easily. Then several boys were able to succeed easily.

Your sentence is correct, but maybe this might be more natural. "Succeed" works better when talking about a game / challenge.

It did require some technique, but the most imlportant part was patience. It did require some technique, but the most important part was patience.

You can either observe the guyplayers who succeed, or you can tried little by little, they ally again and again. You just need patience. You can either observe the players who succeed, or you can try again and again. You just need patience.