Hopeful singers are invited to perform in the capital this weekend, or at several other dates around the country over the next month.
"To be in with a chance of making it through to the UK's most talked-about entertainment show you will need to prepare a verse or chorus of one or more songs a capella," said producers.
"And make sure you turn up early as audition slots are on a first come, first served basis, with slots only guaranteed for people who arrive by 9am."
This year the Liverpool auditions for the singing competition were axed, prompting a response from the city's deputy mayor and former culture spokesman Gary Millar.
Just one person was reported to have signed up for a qualifying round in Colchester last week before another 20 were enticed from the street.