Users can easily export their guest list to a CSV in any event by going to the guest list.

User should navigate to the Events Dashboard, and select their event.

Once in the event, click on Guest List. Select all using the check box at the top of the list, or choose the individual guests you want to export (by filtering or selecting).

Click More Options / Export to CSV.

Be sure to select which columns you want visible before you export — what you see on the screen is what will get exported.