kaspa, I was in the same situation and i think i can help.
First, add base layers to the shoes by putting on polish and buffing it off as you would normal combat boots. Let the polish dry at least a few minutes before buffing. After at least five coats of that, you can start shining.
Get a cloth, wrap it around two fingers(it goes faster this way) fill the lid of the tin with as cold of water as possible. Wet the cloth, and then get a good amount of polish on it. If it is rubbing, not sliding on the shoe, you do not have enough polish. Begin shining the shoe by moving your fingers around in tiny circles. The polish will go cloudy at first, and eventually go shiny. If this does not happen, you need more water, or trying breathing on the shoe, and polishing that moisture in. When the shoe is pretty shiny, and the clouds are almost gone, breathe on it again and continue polishing until the clouds are gone.
Unfortunately, this process takes months, so you‘re pretty much screwed for tomorrow night. Hopefully you‘re in a highland regiment, and the spats will cover your shoes.If not, join a highland regiment.
And by the way-your shoes are good to go when you can hold up your watch and see by the reflection what time it is.