Having a designated room number is a good first step but for our little community we need a set time. We have a pretty dedicated little group of players here but I doubt we all are looking to do multiplayer at the same time on a random basis.
Going forward the way multiplayer works is like this: Each event has 4 multiplayer battles. 2 get released with the initial event and are very easy. I don't even bother to do them multiplayer unless there is a really weird mechanic on them (I think one or two did have something along those lines) but the vast majority of them you just want to do on your own with whatever team you have and clear them. It's an easy 2 Mythril. The last 2 battles come with the bonus battles and are MUCH harder. These are the ones that are best to do multiplayer as intended. The 160 difficulty gives a Mythril and some other rewards. The 200 does not give Mythril but the rewards are still very good including 4 star motes. The 200 fights tend to be very difficult like our Gilgamesh. Right now Japan and Global are both doing V events. The Japan one has the boss that can only be killed with magic so you really have to watch your groups because a single attack resets the fight. But he's actually very easy because he's weak to Fire so people just blow him up with lots of Fire based SBs and Chain Firaga.
On an unrelated note it looks like Japan is going to start selling relics directly for cash. People on Reddit have, as you would expect, lost their shit and many threats of "I'm quitting" have ensued. It sounds like this is going to be a one off thing and there is some form of tradition around buying gift boxes for New Years that they're trying to cash in on. It sounds like the way it works is that these draws are priced like a Lucky Draw (1,500 gems) and are bundles. You buy a bundle and open it up to see what you get.
- The first Bundle is two 11x draws with a SSB or better and then a bag that contains a guaranteed OSB and BSB that come in pairs. There are 5 pairs and you will get one of these pairs at random (Cloud, Tidus, Pecil, Zidane or Bartz) and there is no mixing and matching.
- Bundle 2 is similar but it's just one 11x draw with SSB or better and a bag that contains a BSB + SSB for Faris, Rydia, Celes, Aerith or Yuna.
- Bundle 3 is a 5x draw with a bag that contains one guaranteed SSB from the following Sentinel Grimoire, Platinum Sword, Fire Lash or Thyrus.
No clue if this will ever make it's way to Global. And even if it does the only one I'd consider buying would be Bundle 2. I won't be buying any of these on Japan though. My Japan account is 100% F2P and it's mostly used to try things out before we get them in Global. I have a very dedicated A-Team on Japan (Cloud, Tidus and Beatrix with OSBs, Y'Shtola and Aerith's BSBs, Ramza with Shout and Rinoa and Terra as my token Black Mages with their very outdated BSBs). I tend to pull whenever I just want to scratch that itch or for favorite characters. I don't necessarily try and min / max that account and only my core group is leveled up. I'll go days where the only thing I do is login to collect the daily rewards and not touch it again. I only have about 120 Stamina because it's so tedious going through hundreds of regular dungeons despite all of the Mythril in there. It's still a fun distraction but Global is where I put my time and energy into.