Canberrans are gearing up for one very big night after an already busy day celebrating the city's 100th birthday.
Thousands of people have flocked to the shores of Lake Burley Griffin for what was billed as 'One Very Big Day' celebrating Canberra's centenary.
Up to 100,000 people are expected to take part in Monday's events, which kicked off at midday with some family fun word art, sparking the creativity of the youngest Canberrans.
Roving entertainment was everywhere, while school choirs and opera singers took to the lake serenading the crowd as they drifted by.
Pop up art installations were a huge hit for young and old alike, creating the perfect backdrop for a centenary snap.
Organisers say the event has largely gone to plan so far, apart from the unseasonable heat keeping first aid crews busy and some very big queues.
Event director Jeremy Lasek says the turnout has exceeded their expectations.
"Probably the biggest event ever seen by the lake in Canberra," he said.
The corks have been popped on the world's longest bubbly bar - where more than 3,000 people will get to sample a glass of centenary sparkling wine.
Another highlight of tonight's festivities will be the premiere of a specially commissioned Canberra Symphony on the lawns of Old Parliament House.
Composer Andrew Shultz was asked to write a work with an impressive finish.
"I spent some time wondering whether the finish was too big," he said.
"I think some of the players might have once or twice thought I've asked too much of them.
"But no, its a very, very big ending, the last couple of minutes are very jubilant."
Bands have also begun playing across five stages and at 9:00pm fireworks will light up the lake for the celebration's noisy, but also top secret, finale.
Organisers have been encouraging everyone to take public transport into the CBD to avoid traffic problems around Regatta Point.