Musician will.i.am is performing at the Green Inauguration Ball and the Huffington Post party. (Odd Andersen/ Associated Press)

Prominent Angelenos are flocking to President-elect Barack Obama's swearing-in ceremony and inaugural balls on Tuesday, and to related, high-profile events scheduled for this weekend. We spoke to attendees and party hosts, from Arianna Huffington to Shepard Fairey -- the L.A. street artist who created the iconic Obama poster inducted into the Smithsonian National Portrait Gallery -- about their inaugural plans -- and, of course, what they plan to wear.

Arianna Huffington

Huffington Post cofounder and editor in chief

Which events are you attending?

Our Huffington Post party "Countdown to a New Day" on Monday at the Newseum is a midnight countdown to a new era with Sting and will.i.am performing. The theme is turning the country around with everyone's engagement and participation. We have a video of Americans around the country taking the oath that Obama will take the next day. The slogan: "It's our inauguration."

Your outfit?

I'm wearing a long eggplant taffeta skirt so I can wear flat shoes. My favorites are Dolce & Gabbana brown leather -- they have elastic in the back so they never slip.

Who's the designer?

It's all custom. [Beverly Hills tailor and retailer] Domenico Vacca makes great things in beautiful fabrics. He's become a friend and he'll be at the inauguration ball too. The top is beautiful cashmere by Vacca. I'm not having a lot of stuff made; I'm mixing and matching.

Are your daughters also wearing tailored Domenico Vacca pieces?

No, my daughters are probably wearing H&M.

Cheryl Hines

Actress, HBO's "Curb Your "Enthusiasm" and ABC's "In the Motherhood."

What events are you attending?

The 2009 Inauguration and International Conservation Gala on Monday and the Creative Coalition Inaugural Brunch and Ball on Tuesday.

What are you wearing?