Double & Triple SP Events

"2x SP is back for the weekend! What are you ranking up this weekend?"

- Wombatt

"Don't get killed, get SKILLED!"

- Splash graphic quote

Overview
Double SP Events and Triple SP Events are promotional events that reward players with 2 or 3 times the normal  Skill Points toward Promotion. Anytime SP is rewarded, the player is instead rewarded two/three times the usual amount (which is then distributed amongst the participating units in battle, as normal). These boosts can be combined with one purchasable SP Boost at a time, for up to 4x the normal SP rewards (or 6x during Triple XP Events)!

Double SP Events are far more frequent than Triple SP Events. A Double SP Event called the "Skill Point Extravaganza" tends to accompany the Invasion Competition events. These Extravaganzas seemed to have replaced the regular "Double SP Weekends" and include an added 50% discount on the purchasable Super SP Boost.

So far, there have been a lot of Double SP Events:

Double SP Weekends:
 * October 2012
 * March 2013
 * August 2013
 * October 2013

Skill Point Extravaganzas:
 * February 2014
 * March 2014
 * April 2014
 * May 2014
 * June 2014
 * July 2014
 * August 2014
 * September 2014
 * October 2014
 * December 2014
 * January 2015
 * March 2015
 * April 2015
 * May 2015
 * June 2015
 * July 2015
 * September 2015

Other Double SP Events:
 * Rebel Airstrike & 2x SP, January 2014

So far, there have been six Triple SP Events:
 * 1 Year Anniversary, November 2012
 * 2 Year Anniversary, November 2013
 * Thanksgiving, November/December 2013
 * 3 Year Anniversary, November 2014
 * Christmas Special, December 2014
 * Valentine's 2015, February 2015