Best Visa in my situation

Question

I returned from 2 weeks from Russia 22nd March 2015. I got engaged and now her sister is getting married in late June and we thought we would do the safe way as apply for personal visa as I’m going only over for 9 days. Looks like we are running out of time to get this in before i fly out, unless she takes time off work, sends original to Australia express, which is $$$ and pay extra to process it faster as its cutting it fine.

Question: visiting my girl, going to her sister wedding, what visa I should get.
Note I have fully paid for hotel for all the nights apart from the last 2.
the last 2 nights are in a location where the reception will be  hard to obtain a tourist visa invite  as they are very old school and no English, and will pay on arrival. Single entry only required for 9 days, from Australia.

Question: The best visa? If Tourist visa too soon after last? Length of stay and wedding may influence it being a tourist even tho whole time will be at hotels. Only ever held 1 tourist visa before which was my march trip.

Question : How can i get a invite letter for the last 2 nights, i can for all the days as it’s as the same place, is MAX  2 invites for tourist correct?
What’s the safest option?
Note our proposed marriage has been lodged with Australian immigration from where i will be departing from to attend her sister’s wedding in Moscow.   She is still living and working in moscow until this is finished.
Thanks for any advice, hope it’s enough info for best option as I need this visa soon
Thanks