A toilet racer at HampdenFest. Photo by Tedd Henn.

Festival season is in full swing, with Hampden and Pigtown each offering neighborhood celebrations and one-of-a-kind racing events. Elsewhere, show up for your trash wheel fandom, or check out High Zero Festival’s one-of-a-kind musical performances. And don’t forget the return of Charm City Night Market.

Friday, Sept. 20

Biliana Voutchkova performs at the High Zero Festival. Credit: Photomusix/Cristina Marx

High Zero Festival: Through Sept. 22 at Baltimore Theatre Project. The improvised experimental music festival turns 21. Bringing together musicians who only perform together one time, it puts together pieces that are never heard this way again.

Mt. Vernon Marketplace’s 4th Birthday: Through Sept. 22. The food hall celebrates four years with specials at many of its stalls.

Sips & Yips: 4-8 p.m. at Diamondback Beer. The happy hour supporting BARCS Animal Shelter features live music from Skribe.

O’stoberfest: 5-7 p.m. at Oriole Park at Camden Yards. Pregame at the ballpark with German food and beer in center field. Special ticket package required.

Fish Fry and Mural Unveiling: 5-7:30 p.m. at 901 Arts. The Waverly space celebrates a new mural by Iandry Randriamandroso, and holds a fish fry fundraiser with live music, a raffle and more.

3rd Fridays Canton: 5-10 p.m. at O’Donnell Square Park. The outdoor concert series features music from Jonathan Gilmore and the Experience and Carlos Cubas.

Derrick Adams: Opening Reception: 6 p.m. at City Hall. The artist debuts “Where I’m From,” an exhibition featuring 10 large-scale paintings of scenes from his Baltimore childhood.

Flip Flop Festivus: 7-11:30 p.m. at Four Seasons Hotel. The Life and Breath Foundation for Sarcoidosis hosts the fundraising event with casino games, prizes and plenty of dancing.

Mortified: Back to School Edition: 7 and 9:30 p.m. at Creative Alliance. The deep dive show into teen angst remembers fall changes.

Taking Back Sunday: 8 p.m. at Power Plant Live! The Long Island punk band heads to the Inner Harbor.

Saturday, Sept. 21
Seton Hill Flea Market and Bazaar: 8 a.m.-1 p.m. at St Mary’s Park. The neighborhood hosts vendors, yard sales, artisans, food and more.

Cheers to Clean Water Cleanup: 9 a.m.-noon at six sites in the city. Join nine Baltimore breweries and nonprofits teaming up to clean up trash at six sites in Baltimore. Afterward, use your vouchers to enjoy some locally made craft booze and more.

Smithsonian Day 2019: 10 a.m-5 p.m. Free museum admission around the city. At the  Reginald F. Lewis Museum, the exhibit “EMPOWERED! Black Action Figures, Superheroes & Collectibles” is underway. Or head to the Baltimore Museum of Industry.

Saturday Morning Tunes Movie Soundtrack Show: 10 a.m. at Power Plant LIVE! WTMD brings the family show downtown for live performances of songs from “The Lion King” and “Aladdin.”

HampdenFest 2019: 11 a.m.-7 p.m. at The Avenue (W. 36th St.). The big event descends on the Baltimore neighborhood with three stages of music, a Dangerously Delicious pie-eating contest and, of course, toilet racing down Chestnut.

Zoopalooza: 11 a.m. at the Maryland Zoo in Baltimore. The event features some special times on the wild side with a moon bounce, face painting, a BBQ and plenty of chances to meet the animals.

SQUEAKness (via Pigtown Main Street)

Pigtown Festival: noon-7 p.m. at Pigtown Main Street. Ham it up in the Southwest Baltimore neighborhood with the annual Squeakness races, music from Ursula Ricks Project, The Scotch Bonnets and Rufus Roundtree and Da B’more Brass Band, plus food, drink and kids activities.

Charm City Night Market: 3-11 p.m. at 200 Park Ave. The event giving life to Baltimore’s historic Chinatown returns with two stages, expanded space for food, artists and makers, and more.

Art House Theatre Day: 4 p.m. at Parkway Theatre. The Station North movie destination screens Robert Downey Sr.’s counterculture classic “Putney Swope.”

Rancid: 5 p.m. at MECU Pavilion. The Berkeley punks play by the water with Pennywise opening.

Sue Crawford Opening Reception: 6 p.m. at ICA Baltimore: The artist opens a new exhibition titled “Lines are Feelings Too.”

Trash Wheel Fan Fest: 7-10 p.m. at Peabody Heights Brewing. Celebrate the Baltimore trash wheel family in Abell with performances, a chance to make fan art, food trucks and plenty of local beer.

Monsters Rock: 7 p.m. at Baltimore Soundstage. Bands pay tribute to Metallica, Stone Temple Pilots, Pearl Jam and Guns ‘n Roses.

Laura Carbone: 7-10 p.m. at Rituals. The “Lynchian” signer from Berlin stops in Station North. The Natvral and Joseph & The Beasts open.

Fight Night Baltimore: 7 p.m. at Horseshoe Casino. The Ulman Foundation event features amateur boxing, plus food, raffles and entertainment.

Gauntlet Solo Challenge: 7:30 p.m. at Portside Tavern. The trivia night brings game show vibes to the Canton bar.

Pop Will Eat Itself: 8 p.m. at Ottobar. The English alt-rock band headlines a bill with Chemlab, Curse Mackey and DJ Neska.

An evening with ellen cherry: 8 p.m. at Function Coworking Community. The Baltimore songwriter performs in Hamilton with Americana artist Andrew Grimm and beat boxer Max Bent.

It’s Blackademic! presents “Martin” Trivia. 7-11 p.m. at Motor House. Test your knowledge of the ’90s comedy sitcom in Station North. Plus, ’90s jams and food.

Skin Tight Soul Party: 9 p.m.-2 a.m. at The Crown. DJ Landis Expandis spins the funky breaks in Station North.

Sunday, Sept. 22
Baltimore Record Bazaar: 11 a.m.-5 p.m. at Peabody Heights Brewing. The quarterly event heads to a new location with 30-plus vendors, DJs, craft beer and more.

Bring Your Own Punk Rock Records Day: 11 a.m.-6 p.m. at Waverly Brewing. The bar at the edge of Woodberry and Hampden is setting up a pair of turntables, turning up the volume and letting patrons play the tunes.

Photo by Christine, via Flickr

The Big Dill: noon-6 p.m. at Power Plant LIVE! Dubbed “The World’s Biggest Pickle Party,” the event features plenty of pickled foods, pickle-themed drinks and a country music concert.

Baltimore Deviled Egg Pageant: 1 p.m. at Charm City Meadworks. Baltimore’s home culinary masters offer their take on the deviled egg. The audience picks the winner.

Ravens at Chiefs: 1 p.m. Grab a seat at your favorite bar (or couch), as the home team tries to make it 3-0.

Cupcakes NOT Rats: 2-6 p.m. at Baked in Baltimore. The bakery celebrates its first anniversary with a 1,000-cupcake giveaway.

Alter Bridge: 7 p.m. at MECU Pavilion: The Orlando rockers make a stop on their Victorious Sky Tour with Skillet.

Christone “Kingfish” Ingram: 8 p.m. at the 8×10. The 20-year-old blues artist makes a stop in Federal Hill.