Sounds reasonably ready if those are your only concerns.
Chain should be adjusted as per OEM spec. They are not supposed to run loose. Should find info from Suzuki forums on the web or ask on the Suzuki forum guys here. If chain is way loose then check sprocket tooth wear also as they may be toast - as may the chain be.
Front sprocket guard is required. Fabricate something or purchase the OEM part from eBay or elsewhere. Try Suzuki shop as you never know.....
Fork gaiters are not required
Helmet needs to comply with the list of standards listed in MA MOMS. AS1698 I'd included. Visor removed and run googles in certainly the go unless you are going to do over 100km!
Well done on asking ahead of time. As you say it could save grief.
See you there next weekend all going well