Yes, but use caution:
1. Do not create a disturbance. If you do, you could be cited for disorderly conduct.
2. Do not say anything that is not clearly true. "Publishing" a statement that is factually untrue or confidential can constitute defamation and is actionable.
3. Make sure you're on public property, or you could be cited for criminal trespass.
4. If the police come, be cooperative. It would not hurt to have a digital/cassette recorder with you. If the police arrive, inform them, politely, that you'll be recording the incident.
This being said, your activity may not do any good. Yet, you have a right to peaceably assemble.