The rules PDF lists a Crowning Piece variant (full text below) which lets you continue after the last card is drawn but you must achieve perfection. Can BGA offer this variant?
« Crowning piece » version for expert players
The game does not end after the round where the last card is picked up. It continues until the players are defeated (3 red tokens in the lid of the box/an indispensable card has been discarded) or until the players are victorious (all the fireworks are completed). The players can then find themselves with fewer cards in their hand at the end of the game and the score scale is not used: the firework display has to be perfect or it counts as a loss!