Hal pulling a constintine with danny and forgetting to mention it. Like hal needed to make a deal, and danny makes it a fae type of deal, so hal somehow has a husband.
Que the JL finding it via Shazam finding out from a zues just instinctively knowing that hal has an eldritch husband so Shazam asks why he wasn't invited to the wedding, which makes flash ask why he also wasn't invited. Hal then tried to flip it, but one of his friends detors and said it's because of HOW they got together, Danny was very confused and flustered when it happened, and he told all of his friends and frienenemies about it. Who then told all of their friends so the only ones who don't know are the nonmagicaly social ones.
Basically, hal got a you must give me your firstborn type of deal and somehow marries phantom into the process. Danny isn't complaining and now has an excuse to leave his mountains paperwork 'my love is fighting someone, he's searching for this soul, he's trying to solve a mystery, couples are supposed to spend time together, he summoned me, ect' and they work, Danny now gets a regular sleep schedule.