Check with the Legal Observer Coordinator for your event. Your credibility will be increased and you'll be less likely to be arrested if you dress conservatively. Check out the mainstream journalists - they generally have comfortable, inconspicuous attire. Protect your feet by wearing broken-in shoes and thick socks. Wear an appropriate hat for protection against cold or sun.
Supplies Bring money for food, transportation and phone calls.
Make sure you have adequate food and water - bring more water than you expect to drink, because you may need it for cleansing wounds or rinsing off tear gas or pepper spray. Keep the water in a squirt bottle. You should also have sunscreen and a personal first aid kit. If you use prescription medication, bring it in the original container, with the pharmacy's label on it. Make sure to bring your medication with you if you have asthma or other respiratory problems, to help protect yourself against chemical weapons.