My guess is this will be a shuffleboard style mini game, as this looks like it might be hinting at the May/late Spring theme with May Day/Fairy Queen events we've had the past couple years...
Note I have no actual info, I'm just making a 'best educated gut feeling guess'.
If it is, then our events calendar is looking like:
Jan - Sorc's Pilgrimage (3 rotating chests/other)
Feb - Amunii themed Archaeology event (digging game)
Mar - FA
April - Phoenix (3 rotating chests/other)
May - Spring (Shuffleboard?)
Jun - FA (**note, Sorc's event was here last year!)
July - Elvarian Games/Summer (*3 rotating chests/other last year)
Aug - 'new' event? (dear gods,
please put the FoE Wildlife mini game here!!
)
Sept - FA + Fall Bears? (*3 rotating chests/other in previous years)
Oct/Nov - Halloween (digging game)
Nov - FA
Dec - Winter (*shuffleboard last year)
Just my predictions based on some random whisperings in the Warp...