I tend to not hear about expeditions until it’s too late… does anyone know of a way to get email or push notifications for upcoming expeditions?
No, I don’t know. Sorry
Look into a service called IFTTT (https://ifttt.com/)
You should be able to configure it to trigger an email when the word Expedition gets mentioned on Twitter, Reddit, etc. and it’s free.
Disclaimer: I haven’t used IFTTT in ages, so this is all in theory, but it should be possible/trivial. Let me know if it works for you!
Aside from IFTTT going paid, it’d be tough wading through every mention to spot just the legit notice of an upcoming expedition.
Look out for updates, generally a new expedition starts some days after one is released, on the official website.
Steam offer a way to keep track of updates (even experimental and internal builds)
Keep an eye on Seam Murray Twitter account, it seems to be a tradition that once he post an emoji then a new update is somewhat imminent.