Mix the tequila, pickle brine, lime juice, Worcestershire, hot sauce, celery seed, celery salt, horseradish and garlic powder together in a measuring cup or bowl. Add the cocktail onions to the mix and let soak at least 30 minutes and up to overnight.
Transfer the infused onions to a bowl with a slotted spoon. Stir together the infused tequila and tomato vegetable juice in a large pitcher. Stuff the olives with the feta cheese.
Thread 12-inch skewers with all your favorite fixings: stuffed olives, pickled okra or green beans, grape tomatoes, bacon and cocktail onions. Serve the tequila mixture over ice with a skewer of fixings and the celery.