Guild Craziness is a guild event during which you and other members of your guild can complete various missions in order to receive as many rewards as possible.
Since this is a guild event, in order to take part in it, you will first need to join a guild. If you are already in a guild, then after you tap the corresponding button, you will immediately be taken to the event. To enter the event, you don't need to spend any resources - it's free.
A total of 9 missions are available to complete. Once a day, missions will change to other random missions. If you have not completed a mission in 24 hours, then it will reset and start over. If you have completed all 9 missions, then you will need to wait for new ones to appear.
For completing missions, you receive stars that fill the progress bar of the event. The exact number of stars that you will receive for completing a particular mission can be seen in the "Reward" field.

To speed up the filling of the progress bar, you can use a boost. You can get boosts in two ways: for watching ads and for orbs.
Rewards
As you can see, the progress bar has rewards on both sides: top and bottom. The rewards located at the top are guild rewards. They are received by all players who were in the guild at the time of reaching a particular mark with a reward on the progress bar. New players who join the guild after reaching a certain reward do not receive it and all previously reached ones. However, they will be able to receive all the next ones.
Please note that if you have already received some rewards in one guild, and then joined another guild, then you will not receive the same rewards again.
The rewards located at the bottom of the progress bar are your personal rewards. By default, they are locked and you can get access to them by purchasing a battle pass. After that, upon reaching certain marks on the progress bar, you can receive both guild and personal rewards.
Please note that the pass is only active for one launch of the event. You will need to buy it again for the next events.
Unlike guild rewards, if you change a guild and join the one that has higher progress in the event, then you will be able to collect all the personal rewards that were achieved by the guild before you joined it.