Ended up getting the two Naga I needed from the Legendary banner ... both -Atk. Plenty of pity-breakers too: three Hostile Springs Elise (two for fodder, one +Spd/-Def I'll keep around for now), two Legendary Julia (kept one for Allegiance Battles, used the second to inherit Mirror Impact and Atk/Res Oath to my Regular Micaiah), two Legendary Ike (Warding Breath fodder), one Kaden (merged into the one I already had), one Spring Bruno (Dazzling Staff fodder I suppose?), and one Female Grima (-Atk, so probably future Res Smoke fodder).
Not too blown away by A Splendid Soiree, probably in part because I'm not exactly in need of dancers at the moment - especially with Tempest Trials Rinea and a free Regular Ninian coming up. I'm honestly surprised they're still doing those Dance B skills. Giving up the B slot for a single-target post-dance +3/+4 stat boost just feels so underwhelming. If you care about the buffs, your team is probably better off running Tactic, Hone, or Fortify skills, and even if you really really really want to have this specific type of utility on specifically your dancer, I don't see why you wouldn't just pull for PA!Azura, YT!Olivia, SS!Berkut, or L!Azura instead, since almost all those Dance B skills are 5* Seasonal locked anyway (and of those that aren't, A!Azura costs precious Grails, Lene is still 5* locked, and Silvia has the awkward +Spd/+Res combination).