Addition of Event Handling in campaigns.js

[BrosG]

There are comments suggesting that additional events should be added to the returned value, but it's not clear what those events should be.

Impact: The lack of event handling could lead to missing important changes or states in the application, leading to a potential mismatch between the application state and what is displayed to the user.

Suggested Fix: Define and implement the necessary events. If the intended events are not clear, further clarification should be sought from the author of the comments or the project manager.