Mars Won Pt.1 actually requires Quimby (and the Town Hall), so it won't start till you have that built. This whole event requires level 20 and Quimby (Since Mars Won Pt. 1 requires Quimby).. All the buildings/decorations require level 20. I know most events have only required level 5, but this one is geared to level 20. It is a minor event, if you aren't able to do it, I'd work on doing all the quests and progressing in levels before the Valentine's Day major event, which will start very shortly after this one Ends on Feb. 3.