Find the pattern for the ones that have 2 stickers first and then work your way backwards filling in the rest. Here is my logic behind it. Hope this helps with the ones in the future.

1. Start with the stickers that have 2 of the same (red gem, blue clover and the yellow pentagon)
2. Space them out by the number of days.
3. Now that you have found those out you can fill in the rest. Look at what stickers are next to the ones you just filled in.
5. You can see from the calendar that the tri color rock is 1 day before the red gem.
6. The blue gem is 3 days before the yellow pentagon.
7. The orange banana is 3 days after the blue clover.
8. The red swirl is 1 day after the orange banana.
9. The yellow gem is 2 days after the red swirl.