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@the1up, there are no calendar for the hat events, but there are at least one or two per month, each lasts for about 10 days. Some events feature brand new hats, while some are the recurring old ones. This Easter event belongs to the latter.
The event hats before 2019 are “Rare” hats with x3 power (purple card), which could be obtained only in the tower during the event. Once the event is over, they are available at the hat shop for 500BP each. You can get these hats in the rare chests, too.
Since 2019, Rovio has made a change. The new event hats become the “Exotic” hats with x6 power (red card). These could be obtained only in the tower during the event. After the event, the hats cost 10000BP each at the hat shop. My suggestion is to get as many as these during the event. It requires tons of BP to complete these sets afterwards. Like @doulgas said, go for the low power ones first to get cheap slingshot upgrades before you buy the luxury ones.