How do you snyc 2 cameras when shooting the same event?

Is this something that is done during the filming or can it be done in editing?

Thanks!

both, a there is not really essential need to get the cameras in sync when recording, but using a clapper board or another concrete audiovisual que will help. however as long as the sound is heard as continuous then if the video is a little bit out it is not normally noticable.

It's video of Native American dancing, so it has to be pretty close to perfect or you'll be able to tell.

Another good trick is to use an electronic flash from a still camera. Make sure that both cameras are rolling and recording, then hit the test fire button on the flash. We use this method all the time for multicamera shoots that aren't produced live with a video production switcher.