Do not know much of others charity and funeral. They might give such as keyring as a thank, but what I have seen the most when I went for donate my money or to funeral, books are common.
Most of book in this two occasion is about morality or if it close to category in bookstore might be self-improvement. Inside might have a little biography of people who have pass away or owner of event. To thank all who join and support them. Then, book is quite suitable for everyone and also useful.
So, thank you for giving and sharing such good events and books.