Who you can remember.

This afternoon after work, I took part in my company's dance choreography, which will be shown in this year's annual dinner. Time flies, I still remember the first time I attended college's dancing at college. Same dance steps, but I can't  couldn't remember any until a workmate danced in front of me and I take took some steps.

By the song, something happened 5 years ago, emerging in front of me. - The song reminded me of something that happend 5 years ago.

This is the first time I feel some environment may let you remember something, what may happened long long ago. - This is the first time that I felt the environment around you can help you remember something from the past.

The people may be different, but the environment may is still the same. Even The different people may said even say to you the same things to you as before sentences in the same environment. 

Time flies. The girl who danced in front of me about 5 years ago I lost connection with about 3 years ago. After cherographied, Many dance steps that you learn be teached can be remembered. Sometimes there are people who you may lost lose contact with for many years, but you didn't don't feel it until the you are back in the same environment you experienced.

Interesting writing. Overall good punctuation. Don't forget to concentrate on the correct usage of tenses. I reworded some of your sentences to make them sound more succinct, hopefully they retain your original meaning. Keep up the good work.