It is much more relaxing to ask a guy out with a special place or activity to attend, than just making the request. He might easily ask you what the plan is and nothing is worse than not knowing where you will be. Never make a big deal about it. It could be a big event hosted by your company or some other hangout that will most likely interest him. Knowing what guys like is not often difficult and you can take notes from his conversations to know the kind of event that would make him want to take you along.