What is the penultimate space on Dance Up Earthquakes' top track? Is it a track action that lets it gain 2 extra Energy onto each impending card?

What is the penultimate space on Dance Up Earthquakes' top track? Is it a track action that lets it gain 2 extra Energy onto each impending card?

No, just gives 2 total Energy onto each card, and not as a track action. (For instance, it cannot be skipped.)
Dances Up Earthquakes has two kinds of Energy icons on its top track. The highest normal Energy icon determines how much Energy Dances gains into its stockpile, and the highest Energy-on-an-impending-card icon determines how much Energy Dances gains onto each impending card.