Conversation so far:
where is it that the sun never sets
In Norway, for about a period of 76 days from late May to late July, the sun never sets for about 20 hours.
are there any other places where the sun never sets besides Norway
A quarter of Finland's territory lies north of the Arctic Circle, and at the country's northernmost point the sun does not set at all for 60 days during summer.

Question: is there a name for this phenomenon
Self-contained rewrite: is there a name for when the sun never sets