We need new events,

[Jojoya]

FCs are in massive need of some kind of pick-me-up. I'm not really sure what can be done anymore though because everyone kind of has their own private FC, so any prize/incentive you give FCs, solo FCs continue to benefit from as well. Gotta tread carefully or you make the desire for a solo-FC/multi-housing even more desirable.

Moogle Tome is a step in the right direction, but we do need more events to live up the place.

You were sort of on the right track there. If the feeling is there should be fewer solo FCs, then the reasons for having a solo FC should either be added to the game without requiring a FC, made less desirable or made harder to obtain.

But when it comes to getting players to create or join larger FCs, that's on the individual FCs and the players themselves. Not everyone is after the same thing when it comes to a FC and personality can make a huge difference in how well someone fits in. The game has a huge amount of content available. Is the FC making use of it to keep their members engaged, or does it get ignored because the officers have already done it all and they aren't interested in helping their members complete it? Are the officers not interest in putting some effort into running events whether they're map parties, mount farms, glamour contests, etc.?

And still not every player is going to want to be in a FC. There are reasons why some play alone.

Anything to break up the monotony of constantly being stuck in The Big Three Cities (feat. Costa for summer events).

They take place in the 3 starting cities because that allows low level players to participate. They can even participate a little in Moonfire Faire by hanging out with all the other players there even if they aren't a high enough level to do the quests.

Put a seasonal event at the Crystarium and players who haven't started the 5.0 MSQ wouldn't be able to attend. There might be a few other suitable locations in ARR zones for some of the events to give us more variety but I doubt SE will have interest in placing them in later expansion zones.