Attend a Chanel couture show, shop $20 Anna Sui - all for a good cause

(Anna Sui)

See what's happening in online fashion this week.

Auction house Christie's is hosting its second annual Bid to Save the World Green Auction, and while the live event on March 29 is invite-only, the general public can bid on many items online through April 7. Fashion auction items include an invitation to Chanel's fall couture show (plus meet-and-greet with Karl Lagerfeld), a style consultation with Vogue editor Andre Leon Talley and designer Diane von Furstenberg, and unique Fendi bags.

http://www.charitybuzz.com/auctions/bidtosavetheearth/catalog_items

Flash sale site Rue La La has opened a boutique with Tory Burch on March 22, selling the designer's limited-edition t-shirts to benefit Japan earthquake relief efforts. The pop-up store will remain open for five days (three days longer than the site's usual designer boutiques), and non-members will be able to use Tory Burch's invitation at the below link.

http://www.ruelala.com/tory

For other recently created items to support Japan, visit Ralph Lauren, A Bathing Ape, or Anna Sui.

French designer Anne Valerie Hash has partnered with e-tailer farfetch.com for an online pop-up store that sells her new affordable line AVHASH BY. Launching March 24, the boutique will stay open for a month.

http://www.farfetch.com

Popular Tumblr blog We the Urban , which focuses on fashion photography, design, and art, has turned into an online magazine.

http://www.wetheurban.com