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HOI, HOE KAN IK EEN PAGINA MAKEN MET DE EXTENSIE ICS

First can it be asked not to shout (uppercase) when asking a question.
To answer you cant due to it not being natively supported by HTML but with that said you can import it into "Google Calendars" then you will be able to use/display in your webpage. Or you simply create a link/url to it and the display the link on your page to that the user can the click on to view.

It may also be possible using the following:Full Calendar (PAID) but first you will need to convert the iCalender (ics) to json to be able to use.

More on this: Display your ics calendar on your website

Er is geen standaardoptie voor het weergeven van ICS-bestanden.
Maar in principe kun je echter elk script dat elders werkt, ook in WWB gebruiken.