The new big event format offers an excellent chance to get chrono shards, which in turn will allow you to unlock some really nice skins etc. As a free to play player, this can be quite tricky though
This strategy should cover all big events in the future unless a major change is made to the event format or rewards. The hardest part is completing all 20 levels, if you can't do that then just try and get as far as you can
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Timestamps
00:00 Basic Tips/Strategies
01:52 Level 20 Completed
06:38 Main Focus Of The Event
07:29 Obtaining Extra Event Letters
09:57 Chrono Shop
10:45 Ending
Enjoy!