Sementivae is the 
Roman festival of sowing in honor of 
Ceres, goddess of agriculture and 
Tellus, (Mother Earth).  There are two festivals involved.  The first festival is in honor of 
Tellus and runs from 
January 24 through 
January 26.  The festival honoring Ceres occurs one week later on 
February 2.
All Wikipedia text 
is available under the 
terms of the GNU Free Documentation License