Paris Hilton attends the T-Mobile Presents Google Music at TAO, a nightlife event at the 2012 Sundance Film Festival. - 

From the Marketplace Datebook, here’s a look at what’s coming up Thursday:  

  • In Washington, the Senate Finance Committee discusses "Innovative Ideas to Strengthen and Expand the Middle Class."
  • Is the middle class spending money? The Commerce Department reports on retail sales for February.   
  • And it's the anniversary of earmuffs. That stylish and highly-functional accessory was patented by teen inventor Chester Greenwood on March 13, 1877.