If he wins he becomes a national hero by getting rid of Wladimir Klitschko.
When Vitali went down with injuries, Wladimir helped keep the championship titles in the family.
Still, Boente said he was confident the Wladimir Klitschko-Haye fight will eventually be made.
Haye said he was gloomy about the possibility of fighting Wladimir Klitschko in the future.
Haye, who was comprehensively defeated by Vitali's brother Wladimir in July last year, also attended.
He'll take out Wladimir before summer and take care of Vitali after the summer.
Haye had been scheduled to fight Wladimir last summer before being scuppered by a back injury.
In 20-30 years time no-one will remember my T-shirt, they'll remember the day I violently destroyed Wladimir Klitschko.
Vitali Klitschko is the current WBC heavyweight champion, while his younger brother Wladimir owns the IBF and WBO belts.
However Chisora insists he will not step aside for Haye after Wladimir Klitschko's withdrawal from their planned title bout.
Wladimir's older brother Vitali, the WBC champion, is also on Haye's radar as he targets holding all four belts.
Dereck Chisora's bout against IBF and WBO heavyweight champion Wladimir Klitshcko will be shown on a big screen in the 11, 000-capacity arena.
"I always believed that I would fight Wladimir Klitschko, and my faith has been repaid, " added Chisora, the British and Commonwealth champion.
Wladimir, 33, who has a record of 52 wins and three losses, with 46 knockouts, vowed to make Haye "eat his words".
The life without a brother would be so boring and that's why I'm thankful to my parents I have my brother Wladimir.
Wladimir Klitschko, who together with his brother Vitali has dominated the heavyweight class for years, might have to tune in from bed.
World heavyweight boxing champ Wladimir Klitschko's facial expression was one of disbelief.
But how would he fare against Ukrainian duo Vitali or Wladimir Klitschko?
Wladimir pulled out of his defence against English fighter Chisora on Wednesday, claiming he could not take part because of a stomach injury.
After IBF and WBO champion Wladimir Klitschko pulled out of a title defence against Derek Chisora, his US advisors met with Haye's American advisors.
Adblock Plus is a two-year-old hobby for its creator, Wladimir Palant, a 28-year-old programmer in Cologne, Germany who works for navigation firm TomTom International.
Haye lost his WBA title in July to Wladimir, who also holds the WBO, IBF and IBO belts -- while Vitali is WBC champion.
The Englishman was set to fight Wladimir last year but pulled out with a back injury, later beating Nikolay Valuev to secure the WBA crown.
The Klitschkos' manager Bernd Boente revealed Haye and Wladimir had been close to agreeing an April date, but negotiations broke down at the final hurdle.
Haye wore a T-shirt portraying him holding the severed heads of Wladimir and his older brother Vitali at a news conference in London on Monday.
Briton Haye, 29, says he now wants to fight either WBC champion Vitali Klitschko or his brother Wladimir, who is the WBO, IBF and IBO champion.
Dubliner Paul Griffin out-pointed Bulgarian Wladimir Borov in a featherweight contest while US-based Irishman Oisin Fagan beat Jeff Thomas to win vacant Irish light welterweight title.
Wladimir Anselme, one of the film-makers being showcased at the festival, agreed that the reduced capability of the mobile phone drove him to be more creative.
Taffet confirmed to BBC Sport Online that talks had taken place between Lewis' camp and the representatives of Wladimir and Vitali Klitschko, but nothing further has arisen.
Haye's manager, Adam Booth, held talks earlier this year with Vitali (WBC) and Wladimir (WBO and IBF) about a possible unification fight but these negotiations came to nothing.
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