Disculpa, lo copié en Comentarios: Si quieres preguntar si te está permitido no acudir, que es lo que entiendo, sería: "Can I not go?" Un saludo, Cristina

I believe you are trying to say, "I cannot come?" It is a question one would ask if they were told they could not go to or attend something. I hope this helps.

Si quieres preguntar si te está permitido no acudir, que es lo que entiendo, sería: "Can I not go?" Un saludo, Cristina