Previous chapter Revelation 13 & 14: Beast rises out of the sea/seven heads; another beast out of sea; people 666; Lamb: people Father's name; gospel preached; Babylon fallen; wine of the wrath of her fornication; sickle/reap
Next chapter Revelation 16: The seven angels pour out the seven vials (matches trumpets of Rev. 8, 9, 10, & 11)

Revelation 15
John sees Four beast(living creatures) Seven angels/seven last plagues(vials); tabernacle of the testimony in heaven is opened

Pattern Order
Revelation 15
Spring Feast
#1
Innocence
1And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues;
-Feast of Weeks- 7 Sabbaths
Week 4
Lev. 23
Day 22 of the  "50"
  
Spring Feast
#2
Self Awareness
for in them is filled up the wrath of God.
-Feast of Weeks- 7 Sabbaths
Week 4
Day 23 of the  "50"
  
Spring Feast
#3
Government
2And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God. 3And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
-Feast of Weeks- 7 Sabbaths
Week 4
Day 24 of the  "50"
  
Spring Feast
#4
Promise
4Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy:
-Feast of Weeks- 7 Sabbaths
Week 4
Day 25 of the  "50"
  
Spring Feast
#5
Law
for all nations shall come and worship before thee; for thy judgments are made manifest.
-Feast of Weeks- 7 Sabbaths
Week 4
Day 26 of the  "50"
  
Spring Feast
#6
Grace -in-
5And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened: 6And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.
-Feast of Weeks- 7 Sabbaths
Week 4
Day 27 of the  "50"
  
Spring Feast
#7
God's Rule
7And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever. 8And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled.
-Feast of Weeks- 7 Sabbaths
Week 4
Lev. 23
Day 28 of the  "50"
  
Spring Feast
Previous chapter Revelation 13 & 14: Beast rises out of the sea/seven heads; another beast out of sea; people 666; Lamb: people Father's name; gospel preached; Babylon fallen; wine of the wrath of her fornication; sickle/reap
Next chapter Revelation 16: The seven angels pour out the seven vials (matches trumpets of Rev. 8, 9, 10, & 11)