What are event nominalizations in morphology?

Nominalization is a form of transformation in which a word in a different class—usually an adjective or verb—comes to be used instead as a noun. Nominalization can take many forms, from the very simple (for example, "the annual hanging of the flags became a popular event" and "she hung out the washing" are both cases in which the continuous form of a verb becomes a noun) to the far more complex. At its most basic level in English, we form nouns from other parts of speech by adding accepted suffixes, such as "ship," "dom," "acy," "er," and so on: one who swims becomes a "swimmer," the area over which a king rules becomes a "kingdom," and so on. Because of the way English developed, there is often no logical way for differentiating between suffixes such as "ness," "ship" and "dred," which can often be used to transform one type of noun into another—as in the case of "friendship," which transforms the basic noun "friend" into the abstract noun "friendship."
Transformation in modern English is often criticized for having become "loose," but the creation of nouns such as "dramafest" and "Googlepalooza" is simply a modern extension of a tradition that has run through the whole course of English language development. In the medieval period, many new nominalizations were coined by the addition of suffixes ("kindness" being among them). Transformation also works in the opposite direction. In some cases, we can derive a verb ("googling," "to Google") from a noun ("Google").
The idea of a "complex event nominal" was suggested by the linguist Grimshaw in 1990, but further scholarship has generally worked against the idea that nouns supposedly denoting particular events are created in different ways to others. "Event nominalization" occurs in similar ways to all types of nominalization. An example might be the verb "to use," which suggests an event in which something is used, being nominalized in a phrase such as "her use of language was excellent." As you can see, it is difficult to assess what represents an "event" nominal, as most transformations based on verbs could be described as referring to some "event" at some juncture.
http://www1.icsi.berkeley.edu/~rleegold/ling/puttouse-syn.pdf