Don't collect the materials that you get as rewards unless there is a task for it. If you wanna go a bit more extreme, save the glass/brick/slab rewards for your safe related bonus tasks.
Always send gifts only after the daily tasks for that day appear.
Save all 12 zoo tasks for the zoo task on 4th May.
For level 71 and above, upgrade your barn first on 10th May and second time on 19th May. You can also do 2 upgrades on 10th May if you want to use the Golden Ticket Barn Upgrade reward for the 19th May task. For those below that level, it's better to wait till 19th May and do all 3 barn upgrades together, otherwise you will end up needing to do 7 (3+2+2)
If you want to go for a helicopter sending blitz for your Send Transport Task, do it on 3rd May during Great Freight. Use the Vibrant Market, Double Helicopter and 80% Helicopter time booster during Great Freight. Great Freight also has a 80% Helicopter booster as one of the later rewards. Be warned that it is very time consuming to get all rewards, so manage your expectations well.
Try to keep your barn with free space for the month of May. It will help you stock up on cream, sugar, milk, butter, ingots, feed before the task appears.
Highly debatable, but it is worthwhile to pay 3 tcash every time you see a paid balloon/chest in the mine if you have the elusive nail/hammer task. Also be on the lookout for offers in your market.
Learn the lucky town hack for Need for Speed event later in the month(unless they fixed it ). It will give you free chests which can contain free materials for your task.
Consider reserving 3 slots (you can have 10 ongoing tasks at a time) if you don't want to feed close to 5000 animals. You can feed animals as per your normal routine till 17th May and you can speed it up after that.
Don't wait or ask about x2 rewards (High Voltage) for this event. It is not going to happen. Be done with your tasks quickly as you only have 10 maximum slots for your ongoing tasks
Only purchase Golden Ticket if you are good at Bubble Gum and Need for Speed events as your progression is heavily dependent on it. You can also purchase it only after you see how you do in Bubblegum as the first major perk (Spacious Railcars 1) will be most useful on 2nd May when we have the Spacious Railcar event.
Start making ingots, preferably Gold or Platinum as it will also help you get your artifacts when you send your ships with ingots for the task.
Please comment for other pointers I may have missed.
Ok since nobody could answer me I tested it on one of my little towns and here's what happened:
The next task that came up when there was a day between the max 10 and when I completed one was the next in line not the tasks for the following day. A day did not skip so . . . if we really want to we can hold off and we should(under this theory) be able to complete them all at later times/dates. It just may mean a bit more work in different ways.