can teachers hang out with students outside of school?

Students Meeting Teachers In AWKWARD Situations Outside School (Reddit Stories r/AskReddit)

It is understood that teachers may meet with their students for educational purposes outside of classroom time and that some of those meetings will involve one-on-one meetings. Any such private meeting with a student should, whenever possible, occur with the door open.

Jeff Bliss, a High School student gives a lesson to his teacher at Duncanville [Original]