Adjust rack to top position and preheat oven to 450°F. Line a sheet pan with parchment paper.
On the parchment-lined sheet pan, toss the grapes with the avocado oil, a third of the honey, and a big pinch of Kosher salt and freshly ground black pepper. Roast on the top rack for 15 minutes, until softened and starting to char. Let cool completely.
Heat a small pan over medium heat. Add almonds and cook, stirring occasionally, until toasted and golden, 2-3 minutes. Remove from heat and set aside.
For the dressing, in a large bowl, whisk together the mustard, vinegar, garlic powder, and remaining honey. While whisking, slowly drizzle in the olive oil, little by little, until emulsified. Season with a big pinch of Kosher salt and freshly ground black pepper.
To the bowl with the dressing, add the radicchio, arugula, wild rice, roasted grapes, almonds, and aged goat cheese. Season with Kosher salt and freshly ground black pepper and toss to combine. Serve and enjoy!