I have made some changes to the schedule which can be seen on the main PR page.

Round 4 and Round 5 have been swapped. The dates for round 4 have been moved by a week.
New schedule:
April 26th to 2nd May - Round 4 - Word and Object Placement
May 3rd to May 9th - Round 5 - Shading & Regions.
Please note the changes.