At this time if users are receiving an unsecure message on the landing page of an event campaign, the only way to completely eliminate the security warning is to disable the Landing Page itself. The good news is the registration page is secure and doesn't not produce any warnings.
With that said, we apologize at this time we do not have plans to include this type of functionality due to the low number of tracks from other customers and the prioritization of other ideas. If we hear anything in the future regarding this feature request, we will update the thread.
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