Re-export before the event. Guest responses change as your
RSVP deadline approaches. Export a fresh CSV from JustInvite and reimport it into the same Google Sheet using File, Import, Upload, then "Replace current sheet." Your formatting and sharing settings stay intact — only the data updates.
Name your versions. Rename the sheet tab at the bottom (double-click the tab name) to include the date, like "Guest List Apr 20." Before reimporting, duplicate the current tab (right-click the tab, then "Duplicate") to keep a snapshot of the previous version. This way you can compare changes.
Final export timing. Do your final export after the RSVP deadline passes and responses are locked. This is the definitive headcount you share with your caterer, venue, and planner.