Learn Swedish: De ska äta på minglet ikväll. - They will eat at the networking event tonight.

This follows the Swedish "Place before Time" rule (often called the Rum-Tid rule). When you have both a place (på minglet) and a time (ikväll) at the end of a clause, the place almost always comes first. In English, we often do this naturally, but Swedish is much stricter about keeping this exact order.

What exactly is the word minglet?

It comes from the English loanword ett mingel, which Swedish uses to mean a mingle, a mixer, or a networking event. Because it is an ett-word, adding -et to the end makes it definite: minglet means "the networking event".

Why use the preposition på here?

In Swedish, you generally use på for events, gatherings, and public activities (like a party, a meeting, or a concert). So, to say "at the networking event", you use på minglet.

Could I say kommer att äta instead of ska äta?

You could, but ska is much better here. ska implies a plan or an intention (they intend to eat there). kommer att is mostly used for future events you have no control over, like the weather. Since eating at an event is a planned action, ska is the most natural choice.