If you hurry, you can take the Tap Water Challenge at 2 p.m. at City Hall. There will be a blindfolded taste test of Seattle tap water versus bottled water. Then, Seattle City Councilman Mike O’Brien will pat himself and fellow council members on the back for [UPDATE: According to O'Brien's office, he didn't have anything to do with it; in fact, it was former Mayor Greg Nickels who signed the executive order and encouraged the governor to expand those efforts at the state level.] eliminating bottled water from City Hall in 2008, and Dr. Steven Gilbert will talk about how bottled water can be toxic (real toxic, not like bird-shit-in-the-open-reservoir toxic) because nobody regulates it. So if you're thirsty and near City Hall, this is the event for you! (Seattle City Hall, 600 4th Avenue, in the lobby, 2:00 p.m.)

Ballard's proposed Sunset Hill pocket park has a planning meeting tonight at 6:30 p.m. They have three different pocket park plans on the table. Go. Comment. Criticize. Find out what the hell a pocket park is. They want to hear from you. (Sunset Hill Community Association, 3003 NW 66th St, 6:30 p.m. to 8:30 p.m.)

A federal judge, a police chief and an American Muslim walk into a museum for a panel discussion tomorrow night called In the Balance: Terrorism, Security and Civil Liberties. Panelists are Judge John C. Coughenour, a Reagan appointee whose resume includes the Ahmed Ressam "Millennium Bomber" case, Seattle Acting Deputy Chief of Operations Nick Metz, and Jafar Siddiqui, who is not only an engineer, writer and human rights activist but was also a member of the 2008 U.S. Electoral College. (Thursday at MOHAI, 2700 24th Avenue E, 7:00 p.m., tickets $8)