Looks like there's a popularity contest going on, but the "Voting Tickets" have been stolen so we have to retrieve them. They even translated the cutscenes for this event.
You'll need 2000 Voting Tickets to max out Lechenaultia and a total of 4000 for all the rewards.
All stages have a chance of spawning a bonus stage or raid boss.
?-3 - I went 2-0-1-2 with similar squad/helper speeds.
?-4 - Put 2 in the bottom right tent and a Lilac or fast squad at the top right one.
EDIT: You can view your ticket count at:
Don't forget to vote for your favourite girl!