Welcome to the forums!
Your English is very good so far! But even if you slip up sometime, please don't worry. We are friendly here, and we benefit from the diverse membership; occasional clunky grammar is a small price to pay.
If you are interested in a cheap lens for event photography (concerts, performances, weddings), one to look at might be
Tamron 28-75mm f2.8. It has the wide fixed aperture of a pro level lens, and a middle ground focal length (because your APSC camera has a "crop factor), but is also fairly affordable for an f2.8 lens (some under US$200 on ebay), and could compliment the lens you already have.