If a guy like me, spending this much ACTIVE TIME playing, can't do all 25 tasks others don't stand a chance.
It is hard on inexperienced players for sure. Those of us that have been here forever and started smaller cities can do it easily but there are a few key things newer players may not have done to set up making events as easy as possible.
1. Find the quest list before you start or on day 1 so you can plan ahead, trying to do quest as they come is nearly if not impossible.
2. Don't buy Kp with goods and probably even gold except for events until Chapter 5+ when you are confident you can always meet the requirements with production. Even then it's good to pick one tier and still never buy Kp with it except during events.
3. Have a couple of provinces scouted but not done for when you need relics/solve encounters. Relics are better gotten from the tournament but for Chapters 1-3 you will not have a large enough map unlocked and will have to get some off the world map.
4. Have some stockpiled goods, as hard as that is for small cities, resist the urge to always use everything and use weeks while nothing is going on to hoard a little and act like you don't have until you REALLY need it. (Emergency fund: Pretend 3-5K is your 0)
5. Keep 2 expansion empty or full of culture you can sell and easily rebuild just for building Lv1 buildings for events. It's always nice to be able to throw 10 extra workshops or Tier 1 good factories out there to grind quest faster/preset for the next days quest. (and even a must for most small builds)
6. Keep 200-300 extra population for building temp. event Lv 1 workshops and Tier 1.
7. If possible have a large FS member or neighbor willing to loan you a bad trade to get you through really rough spots and get them back after the event.
8. Make sure you preset as many troops and spells as you can so they are ready when the quest pops up instead of having to wait.
EDIT: Oh yeah, and learn to disconnect roads from finished preset productions until you get to the quest so you don't accidentally collect it.
Those of us that have done so many do most of that without even thinking, it is critical for new players to understand how to be playing two days ahead of where they are.