From the Marketplace Datebook, here’s a look at what’s coming up on March 12:  

• In Washington, the House Small Business Committee holds a hearing on how 3D printing can create opportunities for entrepreneurs.
• President Franklin D. Roosevelt began a series of radio broadcasts during the Great Depression. The first Fireside Chat, delivered on March 12, 1933 dealt with banking.
• And time to put your green thumb to practice. It’s Plant a Flower Day. Digging in the dirt is cathartic.