https://airtribune.com/hg-pre-worlds-2018/info/details__info

I didn't find any local regulations here. The CIVL Sporting Code states:

6.3. Approval and Publication

The Local Regulations shall be approved by CIVL and not subsequently changed,
except under the conditions stated below. In the approval process for the Local
Regulations, CIVL should involve the appropriate committee and the steward who
will be working at the event. Local Regulations should be submitted to CIVL 8
months prior to the event, and approved and published at least 6 months prior.
Once approved, the Local Regulations will be published on the CIVL website and
CIVL Delegates will be notified. The Competition Organiser should, as a minimum,
publish on his website a link to the approved Local Regulations. Any version of
the Local Regulations published by the Competition Organiser before approval by
CIVL must display a clear and prominent statement to that effect.