Lectures on the healthy way of life

Hello! I've just written a letter to my imaginary pen-friend to practice writing in English. Please, check it
"Dear Louise,
Hello there! How are you? I’m writing this letter to tell about the lectures on the healthy way of life, which I visited recently. These lectures were very interesting and helpful. They gave me several pieces of advice, which I can use in my life to make my health stronger and to live a long life.
Lectures on the healthy way of life held every Sunday of October at 4pm. Unfortunately, they had been holding up to 8pm, therefore I was tired after them. But one thing pleased me that the lectures were holding in Kiev, which is very colorful and big city.
These lectures were organized by Ukrainian National Health Organization, which organizes many different events in Ukraine. I think, it’s very useful organization, because it spreads healthy way of life throughout Ukraine. Regretfully, I don’t know anything else about the organization.
The lectures gave me a lot of pieces of advice, which I agree with. The first advice was to eat natural food and to don’t fast-food. In my opinion, the advice is truly useful, because eating less bad food makes your body stronger, and makes your heart more healthier. Another advice was to play sports and make exercises every day in the morning. I really agree with this advice and use it.
So, did you ever visit any lectures? If it is true, tell me about them: when and where they were held, whether you agree with their pieces of advice or not.
Yours Vitaliy."

Thank you very much!!