[noun (place)] + にて [noun (means)] + にて [noun (time)] + にて
にて is the written, formal form of the particle で. It goes after a noun and marks where something happens or how it is done. You meet it in notices, announcements, invitations and business email; in conversation you say で.
にて replaces で the particle – place and means. The で of a な-adjective or of です joining two clauses is a different word and stays as it is.
Spoken Japanese has no use for にて, even in polite speech.
These go beyond place and means.
A notice gives the reason for a cancellation or a change with にて, the way speech uses で.
After a time or いじょう以上, にて marks where something ends.