there is no play node like in matinee for sequencer, so how to trigger it?
You create a Level Sequence Player where you chose a sequence from list and then play it. Like this:
You need to access “Sequencer Player”, either place level sequence on the level and from it use “Get Sequencer Player” or use “Create Sequence Player” to create one. There you got all controls including “Play”
I spent a little while going in circles on this, so thought it worth pointing out that you’ll have to drag the Sequencer object from the World Outliner on to your Blueprint to get access to it. Additionally if you use the option in the “best” answer above you’ll end up with two Sequencer Players, and all sorts of confusion ensues…