In this headline from New York Times,
F.D.A. Advisory Panel to Discuss Ways of Evolving the U.S. Vaccine Strategy
I feel a complement before 'to discuss' is needed, like this:
F.D.A. Advisory Panel (is set/ is about) to Discuss Ways of Evolving the U.S. Vaccine Strategy
Is there any rule to omitting words while maintaining the gist (both gramatically and semantically)?
