North Korea marks the 105th anniversary of the birth of the state founder Kim II Sung on 15th April and in 2012 launched a long-range rocket carrying a satellite to mark the date.
It tested a newly developed intermediate-range missile last year.
Around 200 foreign journalists are in Pyongyang for North Korea’s biggest national day, called “Day of the Sun.”
Officials gave no details of the big event and similar announcements in the past have been linked to relatively low-key set pieces.