First of all, thanks for the new Tom Petty show...it's a great one, and was the source of the bulk of Petty's 1980 KBFH show...however, I believe you've got the wrong date on it.  Petty played two nights at Hammersmith in 1980:  3/6/80 and 3/7/80.  This new show is the second date (3/7/80) - you can tell because during Petty's intro to "Cry To Me" he asks "how many people were here last night?"   On the show you currently have listed as 3/7 (the show you already had posted, not the new one), Petty doesn't ask this...so my bet is that it's really the 3/6, not 3/7 as you have listed.

Yeah, I know....details, details....

The original KBFH show combined tracks from both 3/6 and 3/7, with the majority of the tracks from the second date.  

There's a Petty gigography at:  http://www.bonus-trax.com/basement/tpgigs.htm that shows him on tour in the USA during June of '80.