I couldn't stop thinking about this, so here's a solution (this yields 1494 points):
Kingdom: Black Market (Bm),Throne Room (Tr), Remake (Rm), Rats (Ra), Bishop (Bi), Herald (He), Golem (Go), Duke (Dk), Fairgrounds (Fa), Prince (Pr), Bane: Smugglers (Sm) // Event: Pathfinding (Shelters/Colonies)
All other kingdom cards are in the Black Market deck. Three player game; the player before you bought the first Fairgrounds (Fa1) on his last turn (and drew it to his hand after cleanup). You own a copy of every available card (including Prizes etc) except Duchy and Fairgrounds. You play an Outpost turn. You have Princed 9 Tr. Your +1 card token is on Bishop. You have 12 Dukes.
Other abbreviations: Duchy (Dc), Platinum (Pl)
Your hand: Go1, Go2, Go3.
Play Tr1
choose Go1 (trivial)
reveal Sm1, Sm2
play Sm1, gain Fa2
play Sm2, gain Fa3
reveal Sm3, Sm4
play Sm3, gain Fa4
play Sm4, gain Fa5
Play Tr2
choose Go2 (trivial)
reveal Sm5, Sm6
play Sm5, gain Fa6
play Sm6, gain Fa7
reveal Sm7, Sm8
play Sm7, gain Fa8
play Sm8, gain Fa9
Play Tr3
choose Go3 (trivial)
reveal Bi1, Bi2
play Bi1, draw Pl1, trash Pl1 (+5VP)
play Bi2, draw Pl2, trash Pl2 (+5VP)
reveal He1, He2
play He1, draw Ra1, reveal Re1
play Re1, trash Ra1
draw Re2
gain Dc1, trash Re2, gain Dc2 (+30VP)
play He2, draw Ra2, reveal Re3
play Re3, trash Ra2
draw Ra3
gain Dc3, trash Ra3 (+14VP)
draw Go4
gain Dc4 (+14VP)
Play Tr4
choose Go4 (trivial)
reveal Bi3, Bi4
play Bi3, draw Pl3, trash Pl3 (+5VP)
play Bi4, draw Pl4, trash Pl4 (+5VP)
reveal He3, He4
play He3, draw Ra4, reveal Re4
play Re4, trash Ra4
draw Re5
gain Dc5, trash Re5, gain Dc6 (+30VP)
play He4, draw Ra5, reveal Re6
play Re6, trash Ra5
draw Ra6
gain Dc7, trash Ra6 (+14VP)
draw Go5
gain Dc8 (+14VP)
Play Tr5
choose Go5 (trivial)
reveal Bi5, Bi6
play Bi5, draw Pl5, trash Pl5 (+5VP)
play Bi6, draw Pl6, trash Pl6 (+5VP)
reveal He5, He6
play He5, draw Ra7, reveal Re7
play Re7, trash Ra7
draw Re8
gain Dc9, trash Re8, gain Dc10 (+30VP)
play He6, draw Ra8, reveal Re9
play Re9, trash Ra8
draw Ra9
gain Dc11, trash Ra9 (+14VP)
draw Go6
gain Dc12 (+14VP)
Play Tr6
choose Go6 (trivial)
reveal Bi7, Bi8
play Bi7, draw Ra10, trash Ra10 (+3VP)
draw Pl7
play Bi8, draw Bridge, trash Pl7, opponent trashes Fa1 (+5VP)
reveal He7, He8
play He7, draw Pl8, reveal Tr7
play Tr7
choose Bridge (trivial)
play He8, draw Sm9, reveal He9
play He9, draw Sm10, reveal Rogue
play Rogue, gain Fa1 (no choice due to cost reduction)
Play Tr8
choose Sm9 (trivial)
gain Fa10, Fa11
Play Tr9
choose Sm10 (trivial)
gain Fa12, gain nothing
This should yield 216VP (as indicated in the +VP above). Each Fairgrounds is worth 106 points if I calculated correctly, and you gained all of them, giving you another 1272VP. You also gained 24 green cards, boosting your single Silk Road by 6 other VP. Overall, you now have gained 1494 points.
PPE: Develop into Vineyards is interesting as well, I wonder which strategy (optimized) would be better.