I don't have any hidden gem.
I scout in the market and look if there are some actual gems that I've missed. For the project you've mentioned, I've seen them very active in marketing not only in the forum.
But also in social medias, I won't get in during the sale, I'll wait until they're open to the market.
Can I ask why are you going to wait until the open market? I thought the go to strategy is to buy as early as possible in order to register the highest gains