I honestly feel it would be a waste of time and money for you guys for just one night. Put that money towards Express or an RIP tour for you all and have a more relaxed time, ensuring that you get to see all of the houses and some rides in between drinks
Large groups are also a nightmare for toilet breaks and needing food/rests at different times, you'll probably struggle to make the most of your regular attendance tickets anyway with the amount on offer.
Hope you guys have a blast either way!