Gala Dragalia Showcase

Overview
Gala Dragalia is a special summon showcase which has special features over normal summon showcases, such as:
 * Limited-time Gala Dragalia versions of adventurers will be added, available only while Gala Dragalia is active.
 * Starting with the April 2020 Gala Dragalia (which added Gala Mars), Gala Dragalia versions of dragons may appear as well.
 * Starting from the April 2020 release of Gala Mars, new Gala Dragalia units have alternated between adventurers and dragons each month.
 * The initial appearance rate for adventurers and dragons will be increased to 6% from the standard 4%.
 * If a fails to appear within 60 summons (instead of the normal 100 summons), then a  will specially appear in the summon after that.
 * Starting from the May 2020 Gala Dragalia (which added Gala Leif), Gala Dragalia sometimes features new permanent units alongside the limited Gala units.

Schedule
Originally, Gala Dragalia Showcases were scheduled to take place every two months.
 * However, the Gala Dragalia that added Gala Mars occurred only a month after the Gala Dragalia that added Gala Alex.
 * Afterwards, the June 2020 edition of "This Month In Dragalia Lost" stated that future Gala Dragalia Showcases will be held at "irregular intervals".
 * From July 2020 onwards, Gala Dragalia Showcases have followed a consistent pattern of Gala Dragalia Remix in the middle of the month, and a normal Gala Dragalia featuring a new unit at the end of the month.

Variations
July 2020 introduced a variation called "Gala Dragalia Remix", which has the following changes:
 * Some older Gala units are on rate up - typically one adventurer and one dragon. If there is no Gala dragon on rate up, then a second Gala adventurer doesn't take the dragon's place.
 * The showcase does not introduce a new Gala unit.
 * Not all older Gala units are available in the non-rate-up pool. Usually only one is available, matching the element of the rate up Gala adventurer.

Gala Dragalia Summon Showcases
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