In Magnetiq you can change the Status of multiple attendees inside an event, without having to do it manually one by one.
Just click on the button "Multiple Edit" on bottom left of the guest list.
A pop-up window will appear where you will be able to filter and select a specific segment of attendees that you want to update.
Once you've selected the attendees on the left, just choose the desired option on the right, among:
Finally, click on the blue button Update.
Done. All the selected attendees will be updated with their new status.