So out of curiosity, does every single Holiday in game have a recipe book/books? I only really pay attention at Halloween and Christmas time. I know Brew Day has some. But does Valentine’s Day or anything else like that have some? I’m trying to remember if I saw any actual books and not just actual furniture, etc.
Pretty much every holiday has various Recipe Books. You can look them up at https://eq2.fandom.com/wiki/Live_Events or https://u.eq2wire.com/soe2/recipebooks/ and pick the appropriate category such as Erollisi Day for Valentine's Day.
Most of the events have books. Oceansfull, Scorched Sky and Heroes' Festival do not, but the others all do. For your example of Valentine's Day, Erollisi Day has a new "Romantic Gifts to Craft" book every year. Tinkerfest has Tinkerfest Blueprints each year, etc.
Oceansfull has the two recipe sets that you get from opening clams (Awuidor Marble Building Blocks and the Moving Water Spray Building Blocks), just no books that you actually buy.