Fluff Fest was an independent hardcore punk festival held each July at the Czech town of Rokycany. A significant event for the DIY music scene of Czechia and the punk subculture of Europe, it was associated with movements such as veganism, anarchism, feminism, anti-fascism, and straight edge. It featured international lineups of bands from diverse punk rock genres including hardcore, crust punk, emo, and grindcore, as well as talks and zines. Catering was provided by local animal rights organization Svoboda zvířat.

Fluff originated from Y2K HC Fest, an event organized in August 2000 in Plzeň by Michal Kočan and Tomáš Kadlec. They renamed it for the 2001 edition and moved it to the Rokycany airfield in 2006. Attendance exceeded 3,000 by 2012, when a free side stage called Psych Tent was established outside the paid festival entrance. Organized by Jakub Ďuraško of Stoned to Death Records, the Psych Tent stage has spearheaded the inclusion of more experimental rock and electronic music into the lineup. The last Fluff was held in 2023.

The festival took place at the airfield in Rokycany. The airfield lies between a forest and a highway.

Fluff Fest has been described as a "strain" on Rokycany, which is not otherwise frequented by foreign visitors and subculture members. It brought a business boom to the town, especially in sales of vegetarian and vegan food. The Czech police, including local municipal units, road units, and investigative units, monitored Fluff with the stated goal of preventing crime, tackling theft, and making sure transportation ran smoothly. Theft of cash, credit cards, mobile phones, and cameras had been an issue on the campsite and the organizers paid to remove graffiti from buildings and rented equipment each year. Nevertheless, Michal Kočan stated in a 2013 interview that unlike in Plzeň where the festival was originally held, few complaints from the residents have reached the organizers and their relationship with the local authorities, who appreciate the international attention that the festival brought, is generally positive.

In a 2011 interview, Kočan reflected that the festival's location in Czechia served as a meeting point between "tired" Western Europe where hardcore punk scenes are oversaturated and "raw" Eastern Europe where they are still forming. In 2013, he confirmed that he hoped to showcase more Eastern European bands at future editions.

Vitamin X and Birds in Row have played Fluff four times while Heaven Shall Burn, Good Clean Fun, Endstand, Rise and Fall, Victims, Raein, Dangers, Loma Prieta, and Graf Orlock have appeared three times.

Around 1996/1997, Michal Kočan, Tomáš Kadlec, and Míra Kafka visited Ieperfest in Belgium for the first time and decided to organize their own hardcore punk festival. In 1999, the techno-oriented venue Exist formed in Plzeň, entrusted with the premises of a former swimming pool. The building included a hall with a capacity of about 500 and the adjacent ground provided a large camping area, which allowed Kočan and Kadlec to start planning Y2K HC Fest in the summer of 1999. They spent all their savings on the event and enlisted the help of close friends, forming the core festival crew which has stayed intact since. Y2K was held on 4–6 August 2000 with some 1000 attending and over 30 bands performing, including Good Clean Fun, Point of No Return, Cripple Bastards, Heaven Shall Burn, and numerous Czech ones. Perhaps a week prior, the police seized the premises due to Exist's connection to the drug trafficking present in the techno scene, the club's owner having been arrested. Finally, they allowed Kočan and Kadlec to go through with the festival and even pressured the city to grant them a camping area. Although the amount of work involved led the duo to decide that it would be a one-off event, they reconsidered due to positive feedback and the number of contacts they had already made. From then on Kadlec was responsible for it.

The 2001 edition was held on 3–5 August at the Plzeň exhibition ground and drew perhaps 2000 visitors. It was organized by Kočan and Kadlec along with their English translator Jenny and some 15 friends who worked at the festival from about 2 days prior. They named it after Bellybutton Fluff, a name under which they had promoted shows at the 007 club in Strahov, Prague from 1997 until 2000. They decided to advertise Fluff Fest only within hardcore punk scenes: online, in zines, and through posters and flyers. Performing bands included Vitamin X, Heaven Shall Burn, Caliban, Endstand, and Cataract. At the Vitamin X show, a conflict between stage-diving audience members and organizers who sought to prevent damage to on-stage gear resulted in an early finish. The festival kept moving around Plzeň for 5 years until it settled in Rokycany.