The line-up for the Kent Senior Trophy final was decided on Saturday.
Punjab United staged a remarkable comeback with three goals in the last seven minutes to book their place.
The hosts had trailed 2-0 to a Fraser Page brace for FC Elmstead after an hour. But Roman Campbell converted a penalty on 83 minutes and Harry Ottaway levelled the tie on 86 minutes before Campbell scored the winner.
Punjab will meet title favourites Whitstable Town in the final after Jamie Coyle’s men defeated Rusthall for the second week running.
The Oystermen followed up a 5-0 league win with a 3-0 cup victory, Bradley Schafer scoring twice and Javaun Splatt adding a third from the penalty spot.
The final takes place at Maidstone’s Gallagher Stadium on Sunday, April 19.
In the league, second-placed Larkfield & New Hythe were beaten 2-1 at home by Faversham Strike Force in the Premier Division.
Strike Force, who led through Kane Taylor’s early penalty, had to play the entire second half with 10 men after a red card for Essa Jadama.
Nathan Green levelled for the Larks on 48 minutes but Harry Taylor restored the visitors’ lead two minutes later and they held on to stay nine points clear of the bottom two.
Hythe Town lifted themselves off the foot of the table after collecting their first win since September.
The Cannons came from behind to beat Corinthian 3-1 after Jamie Billings gave the visitors a first-half advantage.
Goals from Robbie Dolan, substitute Uko Oji and Gil Carvalho proved decisive.
Fisher are up to third spot after an injury-time winner from Festos Kamara in a 3-2 triumph at home to Holmesdale.
Another injury-time goal saw Phoenix Sports earn a point from a 2-2 draw at Bearsted.
The Bears twice led through Jarred Trespaderne and a Jake Embery penalty. Louie Downey and Jensen Grant levelled matters for the visitors.
Snodland lost ground in the play-off chase after Ryan Philpott scored the winner for Kennington at Homelands.
Erith & Belvedere are up to fifth after Freddie Baker’s early penalty and a late Ryan Fowler goal sealed a 2-0 home win over Tunbridge Wells.
With the top three in Division 1 not in league action, fourth-placed Lordswood won 4-1 at home to Lewisham to boost their play-off claims with goals from Thomas Davey, Timmy Babington, Rameses Meseorisa and Shaquon Williams.
