My relatives keep majalis at their place. However, the speaker they appoint to give a lecture is not at all qualified. That person does not even know to read Arabic properly. She reads from a book and listens to a few other lecturers and gives a lecture. What should I do? Should I attend such a majlis? Everyone attends for sawaab. However, I don’t really gain anything from those majalis. I don’t really know what to do.

You should advise them. It’s important that majalis are recited by qualified people
If the content is not anti Islamic, then attendance is worthy because of reward of remembering Ahlulbayt (a) and mourning them