persons. The spell allows polygamy. Also, no gender restrictions. You can marry all of your party into one big family, RAW.
You may need to check the local laws, though.
By the way, the spell does not allow for divorce - it's strictly "till death do us part".
can you stack? ie, if I had a couple of clerics and a paladin, could they buff a teen coming of age, dedicate to a deity, and then marry - into some kind of broken superbuff?
wedding Marriage should level up over time. give it the huge honeymoon boost, but also, perks at 5,10,15,20+ years... marriage is hard but it comes with rewards.