The form of future implication: be-deletion [closed]

As we all know "to be continued" refers to the future. However for some reason (I don't know why) we do not use "to be going to + verb" for this.

Sarah to take to the stage tonight

What does this usage mean? Why we don't use "is going to" ?


"Sarah to take to the stage tonight" is an example of headlinese. In headlinese, the type of informal speech used in newspaper headlines, forms of "to be" are traditionally omitted.

This technique is not used in normal discourse between people.