I am novice to RouterOS, so I am not exactly sure what I am asking for is called.

I want to have an open wlan, and anyone that uses it can only browse my website (no auth required).

The idea is to have this set up a sports event and people can view the results, but can't surf the net.

Any help appreciated

Thanks

Hello
i think best solution for your scenario is mirkotik Hotspot
you can allow to your users to access your website without any authentication (/ip hotspot walledgarden) and for using internet their need to be authenticated.

Good luck.