Learn German: Weder machen wir die Radtour, noch grillen wir bei einem Schauer. - We are neither doing the bike tour nor barbecuing during a shower.

Both weder (neither) and noch (nor) take up the first position (Position 1) in their respective clauses. Because standard German main clauses require the conjugated verb to sit in Position 2, the verbs machen and grillen must come immediately after them, pushing the subject (wir) into the third position.

Why is the preposition bei used to mean "during" in bei einem Schauer?

While während translates directly to "during," German frequently uses bei (always followed by the dative case) to express "in the event of" or "during" when talking about weather conditions. Thus, bei einem Schauer (dative masculine) is the most natural way to say "during a shower" or "if there's a shower."

This lesson focuses on es sei denn (unless), but it isn't used here. How could we rewrite this sentence to include it?

To express a similar idea using es sei denn, you would state the negative action first, then the exception. For example: Wir machen die Radtour nicht, es sei denn, es gibt keinen Schauer (We aren't doing the bike tour, unless there is no shower). The original sentence with weder ... noch simply states two definite negative facts rather than a condition.

Does Schauer just mean any type of rain?