Yes, subject to the following guidelines:
Signboards must not exceed 28 × 22 inches.
They must not contain profanity, objectionable images or political messages or imagery.
All words and images must be appropriate and in good taste.
Signboards must not be attached to sticks or poles.
They must not display brand logos or messages.
Security personnel may ask you to lower your signboard if it obstructs another attendee’s view. They may also confiscate signboards that don’t meet the guidelines.