On Tuesday, Celtic celebrated their 125th year as Parkhead prepares to host the Catalan giants for a keenly-awaited Champions League Group G encounter.
But Lennon knows it will be no easy task in overcoming their star-studded opponents, who are top of the group with nine points from three games, including a 2-1 home win over the Scottish champions last month.
"It is a great occasion for the club today, our anniversary and something we are very proud of," Lennon said. "I think tomorrow [Wednesday] night will be a very special evening.
"One, being in the Champions League, two, playing against arguably the best team in the world and three, the anniversary of our club. It is a pivotal year for us, one of celebration.
"How do you solve a problem like Barcelona? You have to play at your very best, you have to be fully concentrated with great intensity and sometimes even then that is not enough.
"But certainly with a full house tomorrow night I am sure the neutrals will enjoy the atmosphere and the energy that our supporters bring and it should be a great night for the club.
"I am hoping that the players do themselves justice on the night."
Lennon still appeared to be upset by the criticism his side received in some quarters following their defeat in the Nou Camp last month.
Former Barcelona star Bernd Schuster claimed that Celtic should not even be allowed to compete in the same competition as Barca, while Rayo Vallecano boss Paco Jemez was quoted as saying he would be ashamed to adopt the tactics employed by Lennon.
"I am not angry with accusations I was disappointed," said Lennon, whose side went down to an injury-time goal from Jordi Alba.
"I have watched Barcelona on many occasions, even away from home they have dominated games to the point where it is 70-30 (in terms of possession).
"In some games against Real Madrid and Chelsea at times it was 80% in favour of Barcelona.
"They are the best in the world at keeping possession and they have proved that consistently for the last seven or eight years.
"We never set out to be defensive but Barcelona force you to play that way. I was very proud of the performance and we almost came away with a superb result.
"We should have come out of the game with an enormous amount of credit."
Lennon clearly felt he had not made his point forcefully enough and returned, unprompted, to the theme later in his press conference.
He added: "The other point I would like to make regarding the performance in Barcelona is that people haven't touched upon the fact that we went to Moscow and scored three goals to win the game and we set about (the Barca game) with almost the same personnel and formation.
"But Barcelona are simply better than most other teams at keeping the ball and penning you in.
"I think that sometimes gets overlooked and I think that sometimes people don't give Barcelona the credit for the way they play the game.
"I think that sometimes that gets taken too readily for granted. It has taken a long, long time to get to that level and it is to be admired.
"Anything can happen in football but it will take a concerted effort from all our players and you hope you catch Barcelona on an off night or at a weak moment and capitalise."
Lennon does not subscribe to the theory that Wednesday night's game is of less importance to his side's chances of reaching the knockout stages than their last two fixtures away to Benfica and home to Spartak.
Celtic are in second place with four points from three games, with Spartak Moscow on three and Benfica with one.
He said: "I don't believe that. I think tomorrow is important. If we can get something out of the game it will give us a strong foothold in the group.
"We can't think about what might happen in the Benfica versus Spartak game.
"We want a positive result but we know it is going to be hugely difficult.
"They (Barcelona) have made the best start to their league campaign in their history and they have won all their Champions League games. So we are under no illusion as to how difficult is going to be.
"We can't go gung-ho or leaves ourselves open or Barcelona will pick us off as they have done to many teams over the years.
"The expectation will be increased because we are at home and our record is good, but we have to be careful and play with the concentration we played with away in Barcelona."