English-mania.

Hi everybody!
Today was a great day. When I arrived to at my work, there was a sign with a legend which read: "Keep calm and English-mania" that meant we only could only speak in English. So, 

At the begining, everybody was shy and quiet, but later started to speak. Even if when we chat, we might should do it in English... I think this is a good practise to improve for improving my speech talking and listening skills. (speech is okay; however, by using 'talking', you create a nice parallel group of gerunds, two -ing words together: reading and writing; talking and listening, walking and running.) 
The best part of the day (apart of from being Friday) is that there was free pizza for everybody, for the CEO's birthday.
Well, I think it was an excellent day, and now, I want to continue practising with somebody...

Feel free to correct this. I'll aprecciate it.

Thank you!

Prepositions are tricky! But, here are some patterns that may be helpful:

I went to work; I drove to work; I walked to work; I caught the bus to work. (all involve movement) from A to B.

I arrived at work; I sat at my desk. I looked at my books. (all involve a single activity).

English-mania.

Hi everybody!
Today was a great day. When I arrived to my at work, there was a sign with a legend: "Keep calm and English-mania"
That meant we only could speak in English. So, at the begining, everybody was shy and quiet, but later started to speak. Even if we chat, we might do it in English If we chatted, we had to do it in English... I think is a good practice to improve my speech and listening.
The best part of the day (apart of being Friday) is that there was free pizza for everybody, for because today is the CEO's birthday.
Well, I think it was an excellent day and now, I want to continue practicing with somebody...

Feel free to correct this. I would appreciate it.

Thank you!