Early Entry Insight

About to take my first trip to Universal Orlando and looking forward most to Epic. Just wondering if anyone has any idea how Universal is deciding what’s open with early entry. I know Super Nintendo World, Celestial Park and Dark Universe will be open but at times I’ve seen people say at times that HPBAM is open at early entry while I’ve also seen Mine-Cart Madness hasn’t been open. Just wondering if it’s random. Trying to sort out somewhat of a game plan. Thanks in advance