Teachers are generally aware that not all students can participate in specific out of school activities and thus they give them many choices or they give them no extra credit. But, whether or not teachers give extra credit for attending a cafe is really not in our control. It is a teacher’s decision.
I strongly discourage it except in the case of enticing the students to check out the program once. If they like it, they will come back. If not, they won’t likely come back unless the extra credit is extremely attractive.