Final answer:
To know if a play was scheduled at the Globe Theatre, Elizabethans would look for a raised flag above the theatre, as other modern communicative methods like newspapers, emails, and social media were not available at the time.
Step-by-step explanation:
Elizabethans would have known a play was going to be performed in the Globe Theatre primarily through visual cues, such as flags. During Shakespeare's time, when a performance was scheduled at the Globe or similar Elizabethan theatres, a flag would be hoisted above the theatre to signal that there would be a play that day. Considering the technological capabilities of the period, options such as reading newspapers, receiving emails, or checking social media were not feasible for announcing performances. Newspapers were in their infancy and not widely available, while electronic communications such as emails and social media would not be invented for centuries. To see if a play was being performed, people would look towards the theatre for an indication, usually the raised flag, which was a sign for playgoers that they could come to watch a production.