How do you invite someone to cinema?
The easiest way is to approach them when they're not busy or distracted so you have their full attention. Then just be straightforward and invite them to come to the movies with you. If you don't know them very well, or if you're really nervous, invite a group of people so they're more comfortable going.
How do you invite people to a movie night?
You can mail them out ahead of time to invite people, or you can hand them out in person as you see people. Just to make it fun, tell everyone that they must have their ticket to be able to enter the movie showing. But let them in even if they forget the ticket!