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NOTE: All Cisco employees & Channel Partners must enter Ideas through this Ideas Portal.
Currently there is an option to set banner/ad for whole Webex site. Referring to the following article: https://help.webex.com/en-us/n7tiehab/Display-a-Banner-Ad-for-a-Webex-Meetings-Site-in-Cisco-Webex-Control-Hub#:~:text=The%20banner%20ad%20displays%20at,Webex%20Meetings%20site%20home%20page.&text=From%20the%20customer%20view%20in,and%20under%20Meeting%2C%20select%20Sites.&text=Select%20the%20Webex%20site%20to,for%2C%20and%20click%20Configure%20Site.&text=Under%20Common%20Settings%2C%20select%20Site%20Options.
There should be a feature to be able to set banner/ad for a specific Webex Meetings/Events session.