We paid for our way there. The school paid for 2 nights hotel and several meals with the coach during our stay. I don't know the rules, but that is what they did for us.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .