There are 5 weekend events: Las Vegas, Japan, Illegal Market, Beach and Monte Capo. These are opened on alternating weekends, Event start time may vary depending on player's timezone.

Missions
These are your typical normal missions. Players collect cash/resources, level up/automate buildings, spin/win/flip at the event building in order to unlock Milestone rewards. These Milestone rewards can only be collected after the event has ended.

Leader-board
Players are assigned to one random division in each new event. The higher you finish in the leaderboard, the better rewards you can get after the event has ended. Players will need to finish in the top 150 to receive any leader-board rewards.

Event building (Slot Machine Treasure Hunt or Lucky Wheel)
5 coins are needed for each spin in the event building. Each spin will give you a reward and if you're lucky you can get a big reward. The event building generates resources with which you can upgrade your event Capos. The resource output can be increased by upgrading the event building with cash.

Event Building
Event Capos
Players won't be able to use their Main Street Capos, but will use Event Capos. All players start with the same Event Capos at the same level in order to create a level playing field. Upgrading your Event Capos will increase their cash output.

Boosters
Each weekend event will have its own set of boosters to increase your cash or resources generation. These boosters can be upgraded by hitting lucky in the event building, but they can also be purchased in the shop.