Blenheim people will get the chance to test their grey matter and join the brainiacs club.

Mensa New Zealand is joining the worldwide celebration of World Intelligence Day on October 1 and is inviting locals to get involved.

Read about it at intelligenceday.com/en/.

Testing sessions will be offered in Blenheim and 11 other New Zealand centres on Saturday.

The testing sessions will give people a chance to see if they qualify for Mensa membership, which is available to those with an IQ in the 98th percentile of the population.

There is a sample test to try online at mensa.org.nz.

To celebrate World Intelligence Day, testing will be offered at a cost of $10, or $5 for students or unwaged people.

Mensa is an international organisation whose members come from all walks of life. Their only shared attribute is a qualifying IQ score.

Marlborough residents can book for the local testing session by emailing testing@mensa.org.nz.

- The Marlborough Express