OT - Etiquette question

[Gams]

If you accept a dinner invitation to someone’s house (that you don’t know well) and then find out they are cooking something you don’t eat, is it better to contact them and tell them something came up and you can’t make it after all or contact them and tell them that while you don’t eat steak, you’d love to just come over and socialize? Neither option sounds quite right but I haven’t been to anyone’s house for dinner in years - when I have met up with people it’s been at a restaurant so I could order what I wanted.