After the new Battle Event starts, make sure to check the "Item Lists" located in the Battle Event's Multiplier tab to see what items are promoted.

The Event Shop can also be very useful as it provides Battle Packs, Gear and other items that may help you.

Keep fighting in the Event Campaign and Event Boss. You only need several fights to gather enough currency to craft Promoted Gear and/or Tokens.

Spending Gems and purchasing offers can grant you bonus rewards from the Top-Up/Spending tabs located in the Grand Event.