Eggy on Jam Cruise 22, photo by Dave Vann

Among many long-running events of the improvisational music world, Jam Cruise holds a special place in the hearts of fans and artists alike. This was the overwhelming sentiment on Wednesday as the floating festival’s 22nd annual outing sailed back to Miami with one final full day of music, giving all aboard a chance to express their gratitude before returning to the world. A last-night-of-summer-camp sort of frantic energy pervaded the last mad dash from stage to stage, and the party raged on deep into Thursday morning.

Wednesday’s musical programming began with a sail-away set from Eggy, who assumed the spotlight on the main stage just as the first stirring of the engines cast the ship off from its port at Ocean Cay, Bahamas. Beaming back the golden hour sun, Jake Brownstein, Mike Goodman, Dani Battat and Alex Bailey brought radiant precision to setlist staples like “Shadow” and “A Moment’s Notice,” then explored controlled, communicative chaos on The Beatles’ “I Am The Walrus” and turned on a dime to stormy thrashing with the closing passage their newer original “Rampage.” Before a finale of “Leatherback,” the band made good use of their star-studded surrounds with sit-ins from Kanika Moore and Jano Rix, who respectively added powerhouse lead vocals and wonky melodica ambience to a cover of Traffic’s “Feelin’ Alright.” “Being able to collaborate with people we admire, new friends, old friends,” Brownstein expressed, “it’s the spirit of Jam Cruise, and it’s just the coolest fucking thing.”

The next act to take over the Pool Deck was Jam Cruise’s annual Super Jam, this year helmed by Sammi Garrett and Craig Brodhead. The Cool Cool Cool bandmates honored a cherished tradition with a litany of special guests and covers that couldn’t happen anywhere else, with Moore, Nigel Hall, Mike Dillon, Tim Palmieri, Reilly Comisar, Brownstein, Battat, Dan “Lebo” Lebowitz, D’Vibes, John Medeski and more joining in for anthemic treatments of Bjork’s “Big Time Sensuality,” Andy Milonakis’ “Pussy Marijuana,” 4 Non Blondes’ “What’s Up,” MGMT’s “Electric Feel” and the B-52s’ “Rock Lobster.” Meanwhile, in the Pantheon Theater, Nashville-based guitarist Grace Bowers contended for the title of heaviest band on the boat, working through a heap of head-banging guitar heroics with the Hodge Podge before a grungy closer of “Eat Shit and Live.”

By the time the Jazz Mandolin Project arrived for their performance in the Atrium, the ship’s most intimate stage was already surrounded. Mandolinist Jamie Masefield cleared the sightlines by inviting those in front to sit inside the “robin’s nest” stage, and fans happily poured in, putting no more than a few feet between the bandleader, Jon Fishman, Danton Boller and Michael “Mad Dog” Mavridoglou and the crowd. The distinctive jazz-fusion quartet flew fearlessly between hard bop, Hot Club-style jazz and minimalist funk in a flurry of racing bass runs, swinging with gusto, grand trumpet blasts and every sound a mandolin can produce. Highlights from the close-quarters performance included the glowy sensitivity and progressive rhythms of “Spiders” and a cover of Stevie Wonder’s “Sir Duke” that spontaneously moved the room to call out the chorus.

Only on Jam Cruise could High Fade’s 11th-hour cancellation spur the entirely unexpected reunion of DRKWAV, the short-lived trio of Medeski, Skerik and Adam Deitch. All three consummate collaborators spent the week joining in as many sets as possible, so the resurrection of their 2015 one-off experimental psych project drew from a vast sonic vocabulary. Medeski bled out thick, moody synthscapes and staccato vamping (not unlike his “Rock Lobster” contributions). Deitch worked the pocket mercilessly, frantically cramming it with crashes and thuds to break up patterns and contracting to a lurch for funkier passages. Skerik darted nefariously, skittering, squeaking, blaring like a foghorn and paying homage to Eric Dolphy. No matter how far they pushed into free dissonance, the trio remained readily capable of snapping back into sharp focus.

Lotus’ blend of jam and electronic music has always been an unstable isotope, liable to heavily favor either side at any time. For their Pool Deck set, the storied quartet read the room and responded with a hard-trance beat barrage, keeping the energetic crowd in rapt attention and nonstop motion. Over pounding four-on-the-floor beats, the band stirred keyboard and guitar interplay into deep house loops that gently pushed the tempo up and down. A particularly engaging section was supported by Octave Cat’s Eli Winderman, whose presence highlighted a lineage from jamtronica’s earliest pioneers to its contemporary innovators.

After midnight, passengers aboard Jam Cruise 22 were presented with a tough choice between three outstanding stagings. In the Pantheon Theater, the mysterious and delightfully campy Here Come the Mummies unwrapped infectious ska-funk laden with synchronized dance. On the Pool Deck, Lettuce set a slick, satisfying mood through their expansive funk suites, striking a perfect balance between bombastic floor-fillers and intricate cool-downs.

Packed into the Black & White Lounge for a full three hours, Skerik commanded the festival’s final jam room and moved masterfully between a range of sounds as diverse as his special guests. At its outset, the saxophonist enlisted the likes of George Porter, Jr., Dillon, Bobby Deitch and Ivan Neville for an unprecedented sprint through the gutter funk, speedcore and sludgy industrial rock of Critters Buggin and The Dead Kenny G’s. By the end of the frame, the bandleader had surrounded himself with artists including Jimmy James, Christone “Kingfish” Ingram, Moore, D’Vibes and Ari Teitel for a roaring impromptu sing-along of Sly & The Family Stone’s “Thank You (Falettinme Be Mice Elf Agin).” Despite the hard 8 a.m. checkout time, a sizeable crowd went on to shut down DJ Airwolf’s Galaxy Disco set at 5 a.m., then slipped down to the mess hall for breakfast.

Get an inside look at the final night of Jam Cruise 22 in the photo gallery below. Secure your advance pass for next year’s outing at jamcruise.com.