In which context is the impromptu speech commonly delivered?

An impromptu speech is typically delivered in spontaneous situations where the speaker has little to no time to prepare. The context of a surprise wedding toast is particularly fitting for an impromptu speech, as it often occurs unexpectedly. The speaker might be called upon to share thoughts or anecdotes in the moment, creating a heartfelt and authentic experience for the newlyweds and guests. This spontaneity is the defining characteristic of impromptu speeches, distinguishing them from more structured or formal speaking contexts like debates, scripted performances, or planned presentations at conferences, where speakers have the opportunity to prepare and deliver content more strategically.