Yep - after ten practices you earn 1.10 stars from your goddess each time you petition her. (Then you level up again and it's 1.20... and so on.)

The levels are limited to the number of hours of the event, I suppose. o.o

I'm not sure if there will be acknowledgment once you've "leveled up" - I forgot to ask Insomniac and it seems he's gone to bed. ^^;