V in n
IV.4 The 'begin' and 'end' group
These verbs are concerned with beginning and ending. The prepositional phrase indicates the situation or event at the beginning or end of something.
His tenure of office began in confusion when his predecessor refused to go.
The first flight nearly ended in disaster when, at 500 feet, a large section of the leading edge broke away from the upper wing.
In the case of culminate and end, the preposition in is sometimes followed by a noun group and an '-ing' clause. This pattern is V in n -ing.
begin culminate end
The final day culminated in children and staff dressing up as characters from favourite books.