Depends. If this is just any gift that would also work for many other occasions, then you don't typically want to put Father's Day as a tag. We don't slap a Christmas tag on anything which can be a gift, for example. But if this product is specifically meant to commemorate Father's Day, then yes, use the tag. A Father's Day card, a Father's Day mug, a Father's Day shirt, all that can have the tag. When you write the tag, if you follow it with a comma, it will load as the two word tag, rather than the two separate words, Father's and Day.
