Hay my Friend as I had organised many events earlier so I would try to help you, as I understand that you have to prepare an attractive introduction for the event and you want some suggestions that would show a connection between that science fiction and dance and music.
I had also read here many had suggested many ideas some for movies, artical, videos and many things.
So I would have to start it I would firstly start with a short story , where somehow alinan were make a connection with us and they have technology and we have talent and at last both want to exchange both with each other and thus somewhere a deadly combination of scapecraft and sci-fi and dance and music were connected, add remember it's should be an interesting story formet, so that people firstly feel a connection . Them after if possible make a video to showing a short story with dance and music ,
And then further if all that happened . You can give any direction to your event in any way, its may a competition among human and alian , may a war, may a teaching show through dance from human to alian, may a start of new friendship or future. It may be anything .
Hope it may help you somewhere. Well I am not best but have an experience, and these idea are practicing possible. So at last nothing , but just thank you.