Hello @PrideWorks ,
The landing pages of the retiring legacy events program are HTTP, however the registration pages themselves, including the pages for payment submission are HTTPS. The only real way to avoid this would be to deactivate the landing page functionality of the legacy event, or make a custom landing page outside of the legacy event and link to your legacy event's registration page through that.
The newer event system is fully HTTPS, including the landing pages.
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