You can now add up to two additional logos on the cover page of the contest booklet.
To do so, navigate to the Booklet Settings page of your contest, and then upload the logos near the end of the form. Click on Apply and allow the booklet to be regenerated.
This is a companion discussion topic for the original entry at https://blog.toph.co/changelog/2021-12-18-extra-logos-contest-booklet/