Marijuana is still illegal federally--Don't give them an easy excuse to arrest you
As protests commence, please remember that Marijuana is still a Class I substance under the Federal Controlled Substances Act, no matter what individual states may say. Your weed card means nothing to the FBI.
The current administration has chosen not to prosecute anyone for violating it, but there is no reason to believe this will continue to be true--and the courts won't save you. Please exercise your freedoms safely.
Edit: This is equally true in Washington DC and downtown Denver. You can be arrested and convicted of possession under the federal laws even in a "legal" state.
(I am a lawyer. I am not your lawyer. This is not legal advice.)