Related Questions:
Batch edits on Bookings
Bulk edits on Events
Bulk edits on Accounts
Bulk edits on Contacts
Bulk edits on Documents
Bulk edits on Invoices
Bulk edits Menu Items
Answer:
Most lists in Event Temple that have a checkbox will allow you to batch select, and then make an update.
Open the tab (or subtab) you wish to perform Bulk Actions on (Bookings, Events, Menu Items, etc)
Select the checkbox at the top of the list or check the boxes next to the items you wish to edit
A drop down will appear at the top
Click the drop-down
Select the action you with to perform
Click the Apply button
Batch updates work per page, meaning if you have more than 25 entries, you will have to update page at a time