Hello @KathyA038 ,
Sometimes specially formatted blocks that rely on account settings, such as the RSVP block, will retain those older settings if they're changed after adding the blocks. Generally it's an easy fix of deleting the block and adding a new one. However, if you're continuing to have issues with your RSVP block's time zone, even after re-adding it after your time zone update, then please let us know so we can do more in-depth troubleshooting.
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