Pig Days

The Pig Days is a special advent calendar for Angry Birds Seasons released on July 3, 2014 (along with the update of South Hamerica). .

Appearance
It appeared on the South Hamerica Update. It only appears when you select the Play Button. It can also appear if you're on Season 2010-2011, Season 2012, Season 2013, Season 2014, and Season 2015

Gameplay
From July 19, levels are unlocked from every specific day, and has each level with a different festive day. The first chapter has 15 levels and the second has 9 levels.

Chapter 1: v4.1.0

 * Sun. 20 July : Commemorates the 45th anniversary of Apollo 11‘s landing on the Moon
 * Thu. 24 July : Marks the Start of the San Diego International Comic-Con Convention
 * Mon. 28 July : Commemorates the 4th anniversary of AngryBirdsNest
 * Sat. 09 August : Commemorates the 841st anniversary of breaking ground on the Leaning Tower of Pisa
 * Wed. 13 August : Celebrates International Lefthanders Day
 * Tue. 19 August : Celebrates Aviation Day
 * Sat. 30 August : Celebrates Bacon Day
 * Sat. 06 September : Celebrates Basketball Finals
 * Tue. 09 September : Celebrates Moon Festival
 * Fri. 12 September : Celebrates Video Game Day
 * Fri. 19 September : Celebrates Talk Like A Pirate Day
 * Mon. 22 September : Celebrates Hobbit Day
 * Mon. 29 September : Celebrates International Coffee Day
 * Fri. 10 October : Celebrates World Egg Day
 * Mon. 13 October : Celebrates Columbus Day

Chapter 2: v4.2.0

 * Wed. 15 October : Celebrates Learn Code Day
 * Fri. 31 October : Celebrates All Hallows’ Eve
 * Sat. 1 November : Celebrates All Hallows’ Day
 * Sun. 2 November : Celebrates Day of the Dead
 * Wed. 5 November : Celebrates Guy Fawkes Night
 * Tue. 11 November : Celebrates Ahtisaari Days
 * Tue. 18 November : Celebrates William Tell Day
 * Fri. 21 November : Celebrates Hot Air Balloon Day
 * Thu. 27 November : Celebrates Thanksgiving
 * Thu. 11 December : Commemorates the 5th anniversary of Angry Birds (Bird Day)
 * Wed. 31 December : Celebrates NYE 2015
 * Fri. 2 January : Celebrates Sci-Fi Day
 * Tue. 13 January : Celebrates Rubber Duck Day
 * Mon. 19 January : Celebrates Popcorn Day
 * Wed, 28 January : Celebrates Data Privacy Day
 * Tue. 3 February : Celebrates Windmill Day

Chapter 3: v5.0.0

 * Sat. 14 Feb: Celebrates Valentine's Day
 * Mon. 16 Feb: Celebrates The Start Of The 2015 "Rio Open"
 * Thu. 19 Feb: Celebrates Chinese New Year
 * Fri. 27 Feb: Celebrates Polar Bear Day
 * Tue. 3 Mar: Commemorates NASA 100YO anniversary (NACA Centenary)
 * Mon. 9 March: Celebrates the "Gold In California"
 * Tues. 17 March: Celebrates Submarine Day
 * Fri. 27 March: Celebrates Hanami
 * Fri. 3 April: Celebrates Easter
 * Sun. 12 April: Celebrates the "First Spaceflight"
 * Wed.22 April: Celebrates Earth Day

Chapter 3 (cont.): v5.0.1

 * Fri. 1 May: Celebrates May Day
 * Tues. 5 May: Celebrates Cinco De Mayo
 * Wed. 13.May: Celebrates Leprechaun Day
 * Fri. 22 May: Celebrates World Goth Day
 * Fri. 29 May: Commemorates the End of Middle Ages
 * Thu. 8 June: Celebrates World Ocean Day
 * Fri. 12 June: Celebrates Magic Day
 * Fri. 19 June: Celebrates Midsummer's Eve
 * Thu. 2 July: Celebrates UFO Day
 * Tue. 14 July: Celebrates Pandemonium Day

Chapter 4: v5.0.1

 * Mon. 20 July: Commemorates Pig Days Anniversary
 * Thu. 30 July: Angry Birds 2 Out now!
 * Sun. 02 August: Celebrates Friendship Day
 * Sat. 08 August: Celebrates Cat Day
 * Tue. 11 August: Celebrates Play in the Sand Day
 * Sun. 23 August: Celebrates Ride The Wind Day
 * Sun. 30 August: Celebrates International Bat Night
 * Tue. 08 September: Celebrates International Literacy Day
 * Thu. 16. September: Celebrates Preservation of the Ozone Layer Day
 * Tue. 22. September: Celebrates Car Free Day

Chapter 5: v5.3.1

 * Thu. 22. October: Commemorates the 5th Anniversary of Angry Birds Seasons
 * Thu. 29. October: Celebrates Internet Day
 * Mon. 02. November: Celebrates All Souls' Day
 * Wen. 11. November: Celebrates Origami Day
 * Tue. 17. November: Celebrates Meteor Shower Day
 * Tue. 31. December: Celebrates New Year 2016
 * Sun. 10. January: Celebrates Crossing the Rubicon Day
 * Wen. 20. January: Celebrates Penguin Awareness Day
 * Mon. 08. February: Celebrates Chinese New Year 2016

Chapter 6: v6.0.0

 * Sun. 14. February: Celebrates Valentine's Day 2016
 * Sun. 28. February: Celebrates Polar Bear Day 2016
 * Wen. 02. March: Celebrates World Wildlife Day
 * Mon. 07. March: Celebrates Women's Day
 * Tue. 08. March: Celebrates Solar Eclipse
 * Fri. 18. March: Celebrates Earth Hour
 * Sat. 26. March: Celebrates Easter 2016

Chapter 7: v6.0.1

 * Fri. 01 . April: Celebrates April Fools
 * Sun. 10. April: Celebrates Golfer Day
 * Tue. 12. April: Celebrates First Spaceflight 2016
 * Thu. 21. April: Celebrates Loch Ness Day
 * Sun. 24. April: Celebrates World Penguin Day
 * Sun. 08. May: Celebrates Mother's Day
 * Thu. 12. May: Celebrates Anger Management (As part of the promotion for The Angry Birds Movie)
 * Fri. 13. May: Celebrates Pigs Arrive (As part of the promotion for The Angry Birds Movie; The day of most international releases)
 * Fri. 20. May: Celebrates The Eagle's Den (As part of the promotion for The Angry Birds Movie; The day of the U.S., Canada, and China releases)

Trivia

 * On the Pig Days map, a mooncake which has a candle on it is seen, so that event would mean it is in commemoration of "AngrybirdsNest" 4th birthday.
 * It is the second game that a Fat Pig appears outside of "Angry Birds Space" and the third appearance of "El Porkador!".
 * It is the second game to have alliteration in the background levels.

New sprites and features
The Pig Days introduced some new sprites and/or features in Angry Birds Seasons:
 * 1-1: Fire sprite. It used later in 1-7.
 * 1-2: Wingman and El Porkador came from Angry Birds Friends, but Wingman lost his 'WHAM!' figures. - The 'ComPigCon' and 'ComBirdCon' posters. - Terence also equipped with a hard ball, chained to him.
 * 1-3 to 1-5: N/A
 * 1-6: Clouds now are 'out of the background' and can block your way.
 * 1-7: N/A
 * 1-8: Basketball and net. It used later in Ham Dunk episode, alongside net stander and and 'Dunk' bonus.
 * 1-9 to 1-11: N/A
 * 1-12: Barad-dûr Tower sun sign and the flag.
 * 1-13 to 2-1: N/A
 * 2-2: A new mask for pigs.
 * 2-3 and 2-4: N/A
 * 2-5: Guy Fawkes clothes for pigs.
 * 2-6: Minion pigs can be flung! - Cannon and swords.
 * 2-7: N/A
 * 2-8: The explosive king pig golden sign.
 * 2-9: Feathers and turkey skin.