Getting hot under the collar? Here’s your cheat sheet for staying calm, cool, and collected.

BUY
13th Annual Summer Poster Show at International Poster Gallery
What: Catch posters depicting all of summer’s sybaritic pleasures — gardens and lobsters to dancing and biking.
Why: The writing’s on the wall.
When: Thru Sept. 21. Mon.-Sat., 10 a.m.-6 p.m.; Sun., noon-6 p.m.
Where: International Poster Gallery, 205 Newbury St. (617-375-0076).

EAT
Lassis at Shanti
What: Chill with authentic sweet or salty yogurt shakes.
Why: Sip into something more comfortable.
When: When temperatures demand.
Where: 1111 Dorchester Ave., Dorchester (617-929-3900).

New Chef at The Met Club
What: Give the culinary stylings of new chef Todd Winer a whirl at the swanky steakhouse.
Why: Steak your claim.
When: How ’bout right now?
Where: The Met Club, 1210 Boylston St., Chestnut Hill (617-731-0600).

BUY
Intermix Sale
What: Nab end-of-summer basics cheap: Ella Moss kimono dresses at up to 60 percent off and Paige jeans at $49.
Why: Summer ain’t over ’til it’s over.
When: A.S.A.P. (Pieces are going fast.)
Where: Intermix, 186 Newbury St. (617-236-5172).

HEAR
Sierra Swan Live
What: Big, sexy vocals from the charismatic up-and-comer.
Why: Better than your average swan song.
When: Sat. Doors at 6 p.m.; show at 7 p.m.
Where: The Paradise Rock Club and Lounge, 969 Commonwealth Ave. (617-562-8820).