The announcement is made right before the Second Coming passage.
In your view, the "announcement" (so to speak) is along the lines of:
" ♫ toot-toot-toot ♫ up next, the WEDDING!" [get ready for RAPTURE UP (to the clouds)--not shown--... and then returning back down!--shown]
As I see the text, the announcement (so to speak) is saying,
--"the marriage CAME" [see comparable use of this word / -form, also in Rev, at bottom of post];
--"the bride / wife [singular] PREPARED";
--"BLESSED are those [plural] HAVING BEEN INVITED TO the wedding feast / supper [i.e. the earthly MK age, up NEXT on the agenda! down there on the earth], parallel about 7-8 other "BLESSED" verses speaking to this same point;
The WEDDED Bridegroom "WITH [UNIONed-with]" His "bride / wife [singular]" then proceed DOWN to the earth (Col3:4), FOR the promised and prophesied EARTHLY Millennial Kingdom age (WHERE "the GuestS [plural]" and "5 [wise] VirginS [plural]" [as "saved" persons "INVITED" during the Trib yrs] are STILL located)... and thereafter the MK-age / wedding FEAST/SUPPER commences.
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Note same word / -form of the word "CAME" used here (does it sound like John is seeing / describing a scene in front of his eyes that this "CAME" word means, "IS COMING UP NEXT [in the scene / chronology]"? :
9and weep over her, and smite themselves for her, shall the kings of the earth, who with her did commit whoredom and did revel, when they may see the smoke of her burning, 10from afar having stood because of the fear of her torment, saying, Wo, wo, the great city! Babylon, the strong city! because in one hour did come [same G2064 word / same FORM and spelling as our word in Rev19:7] thy judgment.
[is this saying, "♫ hear ye, hear ye ♫ ... the above text ^ is saying these ppl are recognizing WHAT'S ABOUT TO COME NEXT ON THE AGENDA"... OR is this "did come / CAME [G2064]" word here, as used in v.10 ^, telling what they already saw AS HAVING OCCURRED in their sight ALREADY, in this "picture"??... Which does the "picture" SHOW?: "UPCOMING NEXT" or "CAME" as being what the ppl "see" already?? (per the text / "picture" ^ told of in vv.9-10, where this word "CAME" is used)]
11‘And the merchants of the earth shall weep and sorrow over her, because their lading no one doth buy any more; 12lading of gold, and silver, and precious stone, and pearl, and fine linen, and purple, and silk, and scarlet, and all thyne wood, and every vessel of ivory, and every vessel of most precious wood, and brass, and iron, and marble, 13and cinnamon, and odours, and ointment, and frankincense, and wine, and oil, and fine flour, and wheat, and cattle, and sheep, and of horses, and of chariots, and of bodies and souls of men. 14‘And the fruits of the desire of thy soul did go away from thee, and all things — the dainty and the bright — did go away from thee, and no more at all mayest thou find them. 15The merchants of these things, who were made rich by her, far off shall stand because of the fear of her torment, weeping, and sorrowing, 16and saying, Wo, wo, the great city, that was arrayed with fine linen, and purple, and scarlet, and gilded in gold, and precious stone, and pearls — because in one hour so much riches were made waste! 17‘And every shipmaster, and all the company upon the ships, and sailors, and as many as work the sea, far off stood, 18and were crying, seeing the smoke of her burning, saying, What [city is] like to the great city? 19and they did cast dust upon their heads, and were crying out, weeping and sorrowing, saying, Wo, wo, the great city! in which were made rich all having ships in the sea, out of her costliness — for in one hour was she made waste.