Questions & Answers about Vi ska upp till efterfesten.
Why is there no verb for "going" or "heading" in the Swedish sentence?
In Swedish, it is extremely common to omit verbs of motion (like gå or åka) after modal auxiliary verbs like ska, vill, or måste when a destination or direction is specified. The modal verb combined with the directional adverb upp is enough to convey that you are heading somewhere.
Would it be grammatically correct to use uppe instead of upp here?
No, you must use upp. Even though the motion verb is invisible, the sentence describes movement towards a destination. Upp indicates this direction (upwards), whereas uppe indicates a stationary position (already located up there).
Is the preposition till always required when a destination follows a directional adverb like upp?
Yes. The adverb upp just tells us the direction of the movement. To attach the actual destination noun (efterfesten), you need a preposition like till (to) to connect them.