The two events that allow for a prospect’s Marketing Cloud Account Engagement campaign to be set are:

When new prospects are imported into Marketing Cloud Account Engagement via a .csv file. A Marketing Cloud Account Engagement campaign is a marketing initiative that you use to track the first touch point with your prospects, such as a trade show, a webinar, or a Google Ad. You can assign a Marketing Cloud Account Engagement campaign to your prospects when you import them into Marketing Cloud Account Engagement via a .csv file, which is a file that contains the prospect data in a comma-separated format. You can use the Marketing Cloud Account Engagement campaign field in the .csv file to specify the campaign that you want to associate with the prospects, or you can use the default campaign that you select when you upload the file4.

When the Google Analytics connector is enabled within Marketing Cloud Account Engagement, which will associate prospects with third-party campaigns. The Google Analytics connector is a feature that allows you to connect your Marketing Cloud Account Engagement account with your Google Analytics account, and sync the campaign data between them. You can use the Google Analytics connector to append UTM parameters to your Marketing Cloud Account Engagement tracked links, and associate prospects with third-party campaigns, such as Google Ads, Facebook Ads, or Twitter Ads. UTM parameters are tags that you can add to the end of a URL to track the source, medium, campaign, term, and content of your web traffic. When a prospect clicks on a Marketing Cloud Account Engagement tracked link that contains UTM parameters, Marketing Cloud Account Engagement will set the prospect’s Marketing Cloud Account Engagement campaign to the value of the utm_campaign parameter, if it exists.