Hello! Advertisement become really annoying and in order to block it, I am using various tools. One of the best ones is https://adlock.com/blog/how-to-get-rid-of-calendar-viruses/ that is helping not only to block ads, but to get rid of various viruses and to provide a normal Internet surf. 

For blocking ads on a desktop browser alone, try either AdBlock or Ghostery, which work with a wide variety of browsers.