These are packs that are only available during the event period and which are designed to help give you a jumpstart during the club event. There are two types of event packs:

Each Club Event has one event pack which contains an exclusive cat which the only other way it can be obtained is with premium keys purchase (not by spinning) after the end of the event. This pack also gives tokens and gems.

This pack is available for 13.99$ and can only be bought once.

There are also other event packs which contain things that if purchased help give you a jumpstart during the event such as tokens, boosts, etc. There is also one which helps your clubmates as well.

There are a few different price points for these packs and they can all be bought more than once.