Kia ora Mike Nelson,
 
On behalf of the Ministry of Business, Innovation and Employment I
acknowledge your email of 16/10/2024 requesting, under the Official
Information Act 1982, the following:
Please tell me the formula currently used for CBAs for major events,
including what factors are taken into account and how these are inputs are
themselves calculated. Please also tell me what the mistake was or
previous incorrect version of the formula.

From RNZ:

'More than just a one-off' - MBIE's incorrect calculations of benefits
from taxpayer-funded events

MBIE general manager of economic development and tourism Heather Kirkham
said that discovery prompted further investigation into other applications
to the Major Event Fund
 
We will endeavour to respond to your request as soon as possible, and no
later than 14/11/2024, being 20 working days after the day your request
was received. If we are unable to respond to your request by then, we will
notify you of an extension of that timeframe. If you have any enquiries
regarding your request feel free to contact us via email to
[1][MBIE request email].
 
Nāku noa, nā
Ministerial Services
Corporate Services, Finance  & Enablement
Ministry of Business, Innovation & Employment
15 Stout Street, Wellington 6011 |  P O Box 1473 Wellington 6140

References

Visible links
1. mailto:[MBIE request email]