Is there any way to check for Limbus Company's rerun banner schedule?

I haven't been playing Limbus Company for even a month yet, and Yi Sang is my favorite character. I wanted to collect Yi Sang and the "Spiderweb" series, but they're locked behind the gacha, so I have no way to get them... Plus, I heard that the gacha will only be available after the current season ends, and that a season lasts a really long time. It feels like it'll take forever to exchange them with shards, so I was thinking of trying my luck if a Yi Sang pickup banner comes out. Does Limbus Company announce pickup schedules in advance or anything like that?