On the publishing side of topical events, it’s not possible to upload a high res logo to a topical event due to issues with compression/ inability to upload SVG etc. Images are either fuzzy, cut off, or SVGs don’t upload at all.

The ideal solution would be to use SVGs, but if you try to upload an SVG as the logo for a topical event, you'll get the error message:
[Logo file You are not allowed to upload "svg" files, allowed types: jpg, jpeg, gif, png]