Yes, provided you also operate within the MAAA MOPs and have permission from the owner of the park to operate model aircraft. See MAAA MOP 057 http://www.maaa.asn.au/images/pdfs/mops/MOP057-Policy-Insurance-Conditions-15-May-2016.pdf

3.6 Flying Venues  The MAAA insurance policy only applies when the land/property owner/lessee has given permission for the area to be used for the purpose of flying model aircraft and any local requirements are complied with. This applies whether the property is privately or publicly owned and indoor or outdoor.  If the area is being used long term, or if it is considered possible that the approval might be challenged, it is advised that the approval be obtained in writing.

The C Tick is a requirement of the ACMA for product that is sold in Australia as providing evidence that the supplier accepts the responsibility that the product meets the Australian Standards. The suppliers are subject to audit by the ACMA to prove they have the supporting documentation.

Certain specific FCC and ETSI Standards, which are listed in MOP058, are accepted by the ACMA as being the equivalent to the standards specified for operation under the 2.4 GHz Class License.
If a C tick has not been applied by either the manufacturer or the importer then the user is the one who accepts responsibility for the product meeting the Australian Standards. This is the legal situation not an MAAA position.

MOP057 is worded to allow this. It is MAAA Policy that our Insurance will only cover our members if they are flying at a Club Field affiliated through an MAAA State Association and any site while involved in MAAA sanctioned activities.

You should also be aware that if non-affiliated members of MAAA are also operating from the same site, they may not have the equivalent or any insurance cover should they injure you or damage any of your property. The MAAA insurance does not provide cover against the actions of non-affiliated members.

The MAAA makes no specific rules for the circumstances that you outline as appropriate procedures will vary from club to club. All members are expected to operate using due care and a Court might take that into consideration when assessing liability for accident.