Any activities connected with a political campaign or election — speeches, debates, and so on — can be called hustings. Presidential candidates often spend more than a year on the hustings.
In the US, hustings are typically called "stumping" or "being on the stump." Hustings is more likely to be used in the UK and Canada to describe campaigning. An event at which candidates address voters or debate each other can be called hustings, and you can also say that a candidate is "on the hustings." The word comes from an Old Norse word, husðing, "council," from the roots hus, or "house," and ðing, "assembly."