I normally try to understand why she would want to become involved. We have many different interests, I am musical, she is poppy, I love reading non fiction and biographies, she loves fiction. So if she was to want to be come involved in one if my interests I would first wonder why and then try to share.
Tbh it would be lovely if she DID share an interest. Apart from the grandchildren, and tutting about their parents, we have almost nothing in common, probably why we have a good, long lasting but actually rather detached marriage.