Here's an idea I just had, sadly I lack the skills and the time to do it myself. But maybe there's some hobby programmer out there who would like to pick this up.
Basically just a background service app, that parses the lottery landing page https://www.lotro.com/en/lotteries every x hours, and gives a notification when the string "no active lotteries" is NOT present. Ideally, it would display the lottery info from the page if there is at least one.
Anyone who wants to give this a try?