If you think there are contaminants in the final coat of lacquer, you can flat the laquer down gently with no problems as long as you don't go through to the colour coat, and then reapply a few more light coats, or the marks may come out with flatting, depending how big or deep they are. You could try rubbing the 1500 grit on something like a wet stone or something like a smooth stone from the garden to just take the grit down a bit, or you could use it in conjunction with a bar of household soap. Wipe the wet /dry paper on the bar of soap before you put it to the fresh paint, but go gently preferably with a block on the flat areas, or as best as you can keep your hand as flat as possible. Whilst the paint is still relatively fresh, if you are not careful, because your fingers aren't a flat area, where the pressure is greater under your fingertips, then this area will remove more laquer and leave lines if you go at it too harshly.
Alternatively because it is still quite fresh, use a finer cutting compound, and keep the cloth in a pad shape as flat as possible. But whatever, because it won't have hardened fully, go gently and you should be ok.
Sunday is a good few days off yet, so I would say it should be reasonably hard to compound it reasonably well in time for you going away, or you could always leave the compounding until you get back by which time it should be hard enough to go at it more vigorously! I would leave putting any polish on it until you come back, but keep your eye on it for any bird crap falling on it which will eat into soft fresh paint quickly. I would also avoid parking it it under any trees if at all possible too because of the tree sap.
I'm sure it will look fine when it all gets assembled!