In Lords and Ladies by Terry Pratchett the witches of Lancre return from their travels to find that a lot has been going on in their absence. Magrat finds that her boyfriend, the king, has been arranging their wedding before even proposing to her. There's also a new group of young witches who are experimenting with magic without really knowing what they are doing. With Magrat busy with her wedding plans and trying to learn how to be a queen, Granny Weatherwax and Nanny Ogg must put a stop to this new young coven and undo the damage they've done.
This book is a hilarious parody that is a mix of The Taming of the Shrew and A Midsummer Night's Dream. It made me laugh a lot and I'd highly recommend it. Lords and Ladies takes place after Witches Abroad and while I would recommend reading that book first to understand some of the references, it's not entirely necessary. It might also help to be at least somewhat familiar with the Shakespearian plays mentioned and have some basic knowledge of quantum theories, but again it's not entirely necessary to enjoy this book.