When Logan Maddy decided to celebrate his birthday with a concert two summers ago, he rented out The Basement and begged his friends' bands to play.

When Logan Maddy decided to celebrate his birthday with a concert two summers ago, he rented out The Basement and begged his friends' bands to play.

"It was more of a party than a show," said Maddy, 19, who had just graduated from Gahanna Lincoln High School at the time.

Loganpalooza brought together a handful of bands from a bustling teenage rock scene dominated by hardcore breakdowns, electronic backbeats and Vocoder-coated emo howls.

Maddy's involvement in local music had never gone much further than working the merch table for his buddies' bands. But his party was so successful at mobilizing the scene that Down Front Productions, the promotions company that helped him organize the event, suggested he throw more of them.

Suddenly, Loganpalooza became a franchise.

Another concert followed in December 2007. By the time the third installment occurred last August, Loganpalooza had become the signature event of the skinny-jeaned, flatiron-banged teenage scene. Fast-rising locals like Attack Attack! and The Crimson Armada played to a sold-out crowd at stacked Arena District clubs The Basement and House of Crave.

The buzz for the fourth go-round is so big that Loganpalooza is moving to the 1,700-capacity Newport and splitting into two dates. Saturday's kickoff will be followed by another full slate of acts on June 6.

How did Maddy's pet project pick up so much steam? It helped that he booked the occasional respected out-of-towners, such as Every Bridge Burned. But more than that, he got together a bunch of diffuse social circles who thought they were worlds apart and showed them just how much they have in common.

"To have everyone come together and get along was the best part," Maddy said. "It was a bonding thing."

This latest incarnation of the fest features the most diverse lineup to date. Besides scene staples like The Promise Estate and City Lights, Maddy has added some slightly older acts like spasmodic genre-jumpers The Heartland and studio-slick garage rockers Chelsea Automatic.

Maddy, who is pursuing his certificate in artist management online through Berklee College of Music and serving as tour manager for City Lights, has booked the occasional gig besides Loganpalooza, but he hopes to focus his promotional energy on new editions of the festival for the time being.

He likes the idea of continuing to expand Loganpalooza's range by mingling bands from the bar scene amidst the underage ragers. But at least until he and his contingency dive deep into their twenties, Loganpalooza will likely remain a rallying point for Columbus' most youthful musical ambassadors.

"The high school kids love to play stuff like this," Maddy said. "That's how it started."

And they aren't shy about asking. The number of bands knocking on Maddy's door for a spot on his lineup is mind-boggling to a guy who remembers persuading bands to play his first show. Loganpalooza has come a long way in such a short time.

"It's kind of a bummer to have to tell people no," he said.