Hi @PeterT4965. Thank you for the idea of having more customization with the Event action block. We're updating the status of this idea to more accurately reflect its current status with our engineering team, and also made slight changes to the subject line in order for it to be more easily found. We can't guarantee a commitment to deliver on this feature request, but it should indicate some awareness that we have heard your feedback and could be taken under consideration for a future release.
In the meantime, you can use a standard block layout for the desired image and text and include a button with a link to the registration URL.
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