User blog comment:YellowMonica/GARDEN PARTY TO CELEBRATE LEVEL 5000/@comment-38753491-20190706161712

That event is meant to celebrate 5000 levels. So here's the possible timeline:

Day 1 (7/6): 1000

Day 2 (7/7): 2000

Day 3 (7/8): 3000

Day 4 (7/9): 4000

Day 5 (7/10): 5000

That means the 5th day will coincide with the actual release of level 5000!