Do the Muenster mash.

FEAST
The Grilled Cheese Invitational
What: Battle amateur and professional chefs for the title of grilled cheese champion or just embrace all things cheesy — from Gouda-themed poetry and live music to vendors slinging their spin on the celebrated sammie.
Why: It’s the best thing since sliced bread.
When: Sat., 11 a.m.-6 p.m.
Where: 1001 Rose Bowl Dr., at Seco St., lot f, Pasadena.

MessHall Kitchen Boot Camp
What: Get a sneak peek of the upcoming Los Feliz eatery with three courses of inspired Americana fare (buttermilk crunch chicken with whiskey gravy, scout cookie with marshmallow and caramel).
Why: Classic cocktails by Josh Goldman (Ink) and Julian Cox (Sotto, Picca).
When: Fri., 7 p.m.-1 a.m.
Where: Short Order, 6333 W. Third St., at N. Fairfax Ave., Mid-City West (323-761-7970). Email testkitchen@shortorderla.com for reservations.

SHOP
Swedish Hasbeens Pop-Up
What: Lace, buckle, and slip on a curated selection of the cult shoe label’s new ’40s- and ’50s-inspired collection while sipping PBR and guessing what the secret performance will be.
Why: Take home a free leather skinny belt when you spend $200 or less; spend more than $200 and get a leather envelope clutch.
When: Tonight, 7-9 p.m.
Where: American Rag, 150 S. La Brea Ave., b/t First & Second Sts., West Hollywood (323-935-3154). R.S.V.P. to jenniferl@postandbeam.is.

SAVE
Elizabeth and James Sample Sale
What: Impossibly cool staples coveted by uptown and downtown girls alike at 50-70 percent off.
Why: Find deeply discounted Patterson J. Kincaid blouses and dresses in the mix.
When: Fri., 10 a.m.-5 p.m.
Where: The Cooper Building, 860 S. Los Angeles St., at E. Ninth St., ste. 415, Downtown.

Twelfth Street by Cynthia Vincent Sample Sale
What: Take 60-70 percent off floaty chiffon dresses, resort-ready sandals, and printed totes from the local designer’s spring collection.
Why: A stash of samples priced at $40.
When: Fri., 9:30 a.m.-5 p.m.
Where: The Cooper Building, 860 S. Los Angeles St., at E. Ninth St., ste. 422, Downtown.

Photo: Dana Hoff / Getty Images