Late for the party, I know, but Aeria has an official twitch. Here you can hang out while watching people showcase the game I guess? I'm not sure exactly what they're doing, but if you're the type who wants to watch a stream related to Twin Saga, here it is. It also seemed like they did a giveaway last time, so it might be worth checking out!
If you missed the last stream, you can watch it on their twitch or here on youtube. Or you can watch it here on the wiki!
If you wanna know when they're gonna stream, I think they announce it in beforehand on the following social medias: