1-This pizza is to eat tonight.
2-This film is to see as soon as possible.
3-This tie is to wear at fancy places.

Are these sentences grammatical?
Could any of them be used in spoken English?

Dear N:

No. To make them standard English, you must put the infinitive in the passive voice. The infinitive is a subject complement, that is, it renames the subject, and in none of the sentences is the subject doing the action.

1a This pizza is to be eaten tonight.
2a This film is to be seen as soon as possible.
3a This tie is to be worn at fancy places.

It would be very unlikely that anyone would say #2a, but it is grammatically OK.

We note that other languages do use infinitives the way your original sentences are written, but it is confusing in English.