Hey there!
This sounds like a fairly straightforward project. I'm highly adept at the skills mentioned (website update, Mailchimp, releases), and funnily enough, I worked on something very similar for an NBN conference earlier this year.
I'd be happy to send through some of the NBN work - importantly, the conference was being hosted by the client, but as I understand it, the deliverables would be relatively similar (Mailchimp blasts, brochures/pamphlets, web content).
I look forward to hearing the specifics from you!
Cheers,
Troy