This is the 609th most frequent Finnish word.
tapahtumien
The Finnish word "tapahtumien" means "of the events" (genitive plural form of "tapahtuma").
In this sentence, 'tapahtumien' is the plural genitive case of 'tapahtuma', referring to the possession or relation of the events to something.
Tapahtumien kulku oli odotettu.
The sequence of events was anticipated.
Here, 'tapahtumien' indicates the genitive plural form, linking the organizing action to the events.
Hän osallistui monien tapahtumien järjestämiseen.
She participated in organizing many events.
In this context, 'tapahtumien' relates the historical events to the analysis presented by the book.