Using "was/were to plus infinitive" and "was/were to have plus past participle" to talk about arranged events that were in the future at a certain moment in the past.
We use “was/were to + infinitive” to describe events which took place, and“was/were to have + past participle” to talk about events which didn't happen.
Future in the Past: Lesson (Would, Past Continuous, Going to, Was/Were to + Infinitite, Was/Were to Have + Past Participle)
Future in the Past: Exercise on "Going to"
Future in the Past: Exercise on "Would" & "Going to"