Weekly Event

Weekly Event is a game mechanic introduced on version 1.10.14 of Plants vs. Zombies Heroes. It allows the player to obtain event-exclusive cards with a new currency called tickets. Each week, a new card will appear replacing the old one, making it no longer obtainable outside crafting.

Tickets
Tickets are a special currency that are used to obtain that week's card. Winning a single player mission battle will award the player 10 tickets. Winning a multiplayer match will award the player 15 tickets. Each copy of a card requires a specific amount of tickets.

As of update 1.14.13, tickets can be acquired from s. Winning a Daily Challenge grants 100 tickets each. There are also ticket rewards for winning multiple Daily Challenges in a row.

Boost
Boost is a mechanic that will allow the player to obtain more tickets by playing a hero with a specific class. Each Weekly Event has four boost classes, two plant classes and two zombie classes. Winning a match as a hero that has one matching class will multiply the tickets the player receives by five. Winning as a hero with two matching classes, on the other hand, will multiply their tickets by ten. For example, the boost classes of the week for the zombies are Brainy and Sneaky. If the player wins a match as Rustbolt or any other Brainy hero (or any Sneaky hero), they will get five times the tickets. However, winning as, who leads both Brainy and Sneaky, will grant the player ten times the tickets.

After using a boost, the player will need to wait for four hours before the boost refills to use it again, or they can pay 20 gems to refill it instantly.

The boost may target classes led by the hero the player does not have, for example Mega-Grow and Solar when they do not own Chompzilla yet. In this case, a Hero Pack will be available at the For You section in the until the event ends, which contains the Hero with two said classes alongside five premium cards.

List of cards obtained via events
The table below shows when each card was able to be obtained and how many tickets were needed to obtain one card.

Strategies
The main strategy is to grind. Since you can only get a certain amount of tickets each day, playing more will give you more tickets, unless you have enough gems to earn more tickets through hero boosts.

Trivia

 * Every weekly event, a time travel pack is available in the store, which hints to the card that will be available two weeks after the current weekly event.