These events are the ones where you meet another Bergson and have to either fight through enemies with them or protect them while they cast some spell. The former is extremely easy, just keep yourself alive and you should be fine.
The second one can be a bit tougher, depending on the Bergson you use. Any crowdcontrol characters are better for this than the single-enemy-targeting Bergsons.
You should get this naturally on your way to completion.