Can I remove the advertising?
You have created a private calendar and no longer want to see ads in it? You can either select the corresponding link in the publish dialogue in the editor or buy the corresponding feature in the Add-ons store.
It is also possible to "buy free" in the public display of your calendar: A pop-up appears the first time you enter the page. Using the link provided here, each visitor can remove the advertising for themselves and all other visitors at the same time. As soon as your calendar has been purchased free of advertising, the advertising will not appear again.