You should be wishing them to have a good whatever it is they do celebrate as that is the Twas The Fortnite Before Christmas shirt So, if you know someone is celebrating Hanukkah, wish them a good Hanukkah celebration. If they are celebrating Diwali, wish them a happy Diwali. If they celebrate Kwanzaa, wish them a happy Kwanzaa. It doesn’t matter. If you know what they celebrate wish them a good celebration of their celebration. Don’t wish them a good celebration of something they aren’t celebrating.