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. It has ended in Summer Camp update and replaced with The Pig Challange.

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 February: Celebrates Valentine's Day
 * Mon. 16 February: Celebrates The Start of the 2015 "Rio Open"
 * Thu. 19 February: Celebrates Chinese New Year
 * Fri. 27 February: Celebrates Polar Bear Day
 * Tue. 3 March: Commemorates NASA 100YO anniversary (NACA Centenary)
 * Mon. 9 March: Celebrates the "Gold In California"
 * Tue. 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
 * Tue. 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)
 * Sun. 29. May: Celebrates First Ascent of Everest
 * Wen. 01. June: Celebrates World Milk Day

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.
 * 1-6: Clouds now are 'out of the background' and can block your way.
 * 1-8: Basketball and net. It used later in Ham Dunk episode, alongside net stander and and 'Dunk' bonus.
 * 1-12: Barad-dûr Tower sun sign and the flag.
 * 2-2: Zombie pig costume.
 * 2-5: Guy Fawkes clothes for pigs.
 * 2-6: Minion pigs can be flung! - Cannon and swords.
 * 2-8: The explosive king pig golden sign.
 * 2-9: Feathers and turkey skin.
 * 2-12: Alien pig costume and floating object. It used later in Invasion of the Egg Snatchers episode.
 * 2-13: Rubber Duck. It used later in Angry Birds 2 as Power-Up.
 * 2-14: Popcorn and Shovel.
 * 2-15: Fuse, Pickaxe, Scarf and Stop sign.
 * 3-1: Big Red Ballon
 * 3-2: Tennis Racket, Tennis Ball and Rio Open banner sign
 * 3-5: Space Helmet and Wrench
 * 3-10: Pepper
 * 3-11: Windmill
 * 3-12: Hats and Cow costume.
 * 4-1: Wigs
 * 4-2: Newspaper
 * 4-3: Fish...
 * 4-9: Straw House. It used later in Angry Birds 2 as First level.
 * 4-10: Devil Rubber Duck.
 * 5-7: Origami
 * 5-9: Big Glass
 * 5-10: Straws
 * 6-2: Warning block.
 * 6-12: Wig