This has been held on an irregular basis since 1956.

Since 1952 a town government has been elected on an irregular basis.

The group have since then kept active mostly thanks to new members joining at irregular basis.

On an irregular basis, special guests would open up the show.

Meetings were held in the school room on a rather irregular basis.

This meant that matches took place on an irregular basis, sometimes more than once a year.

Other courses may be offered on an irregular basis as well.

The school was operated on an irregular basis, and closed for years at a time.

The journal was established in 1967 and is published on an irregular basis.

The series will appear on an irregular basis in Sunday.