The city cannot decide what season it is this weekend, and honestly that is the fun of it.

Downtown turns into a free jazz festival, Kennywood flips on its first haunt of the year, and there is baseball on the North Shore with football right behind it Sunday.

Summer and fall are sharing the calendar, so pack a light jacket and pick a lane.

In today's What's On Pittsburgh:

Let's get to it. - Madison Johnson

🎷 The Pittsburgh International Jazz Festival takes over downtown Friday through Sunday for its 16th year, anchored at the August Wilson Center with stages spilling onto the surrounding blocks. More than a hundred players, a theme built around America at 250, and free street programming sharing the bill with ticketed indoor concerts. Check the schedule and pick your night.

⚾ The Pirates host the Kansas City Royals for a three-game set on the North Shore, Friday through Sunday. September baseball at PNC Park, skyline lit behind the outfield, is one of the easier yeses in town no matter what the standings say. First pitch Friday is 6:40 p.m.

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Haunt season opens tonight. Family rides and fall food carry the daylight hours, then the sun drops and the scare zones and haunted houses take the park for the first time this year.

Fifteen years running, this Carnegie parish throws open the doors for hand-made Ukrainian cooking, a loaded bakery table, and the kind of church-basement hospitality you cannot manufacture.

Texture Contemporary Ballet opens its 16th season at the New Hazlett, leading with Alan Obuzor's shape-shifting choreography and dancers worth a close seat.

OPDC and Pitt turn a neighborhood cleanup into a competition for its tenth year: grab gloves at Zulema Park, fill bags, and play for bragging rights over coffee. Do-gooding with a scoreboard.

City Theatre opens its Mainstage season on the South Side with In Clay, a brand-new play in its first Pittsburgh run. See it before the reviews land.

Assemble reboots its old MakerDate into a first-ever unicorn party in Bloomfield: hands-on making, a little magic, and zero shame about the theme.

Road to Lost Evenings IX brings Frank Turner's singalong folk-punk to Mr. Smalls, an all-ages, sweat-on-the-ceiling kind of night, with Emily Wolfe and Black Guy Fawkes opening.

Grace Helbig and Mamrie Hart have spent nearly twenty years making each other laugh in public, and this City Winery night is exactly that: two best friends refusing to behave onstage.

Brookline Boulevard's market sets up at the Cannon parklet with produce, honey, baked goods, and prepared food, worth the walk for the neighbors alone.

Yinz Mahj sets up open tables at The Conservatory in Shadyside for a morning of mahjong, built for players who already know the game.

Bakery Square puts the Steelers game on its courtyard big screen, free, with food and drinks in reach and a crowd that beats the couch.

🍜 Wok Hei Asian Kitchen took over the old Original Hot Dog Shop space in Oakland, keeping the O's corner alive with build-your-own noodle bowls and customizable plates.

😂 Arcade Comedy Theater is back with the third volume of its Sketch Lab Report, a showcase of new, subversive humor writing from the theater's own workshop.

📚 The Oakmont Carnegie Library partially reopened Monday after summer flooding, welcoming readers back into part of the building while repairs continue.

🏈 The Steelers opened the season with a win, T.J. Watt setting the tone and the defense closing it out late.

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