Narrative:

Announced departure on unicom and started rolling, was advised on unicom that a temporary tower was in operation. Too late to call tower so continued takeoff end of story. Ps: when temporary tower is in operation, make a sign at runup to advise departing sky gods.

Google
 

Original NASA ASRS Text

Title: SMA PLT DEPARTS WITHOUT TWR CONTACT. TEMPORARY TWR ACTIVE.

Narrative: ANNOUNCED DEP ON UNICOM AND STARTED ROLLING, WAS ADVISED ON UNICOM THAT A TEMPORARY TWR WAS IN OP. TOO LATE TO CALL TWR SO CONTINUED TKOF END OF STORY. PS: WHEN TEMPORARY TWR IS IN OP, MAKE A SIGN AT RUNUP TO ADVISE DEPARTING SKY GODS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.