The Illuminarium turns into a nightlife venue and hosts a Space After Dark experience for adults (21+), which includes a selection of specialty cocktails and small bites. Tickets are $35 (or $45 and include one of the signature cocktails, which is worth it since the cocktail Pete bought when we were there was $16). The Illuminarium used to host the Ultra Lounge on Saturday nights from 9 pm to 2 am, which was for adults (21+) and had a DJ playing music while you sip cocktails in night markets of Tokyo and floral gardens of France. Tickets aren't currently available for that, but I haven't found anything that said it's closed completely. So don't plan your trip around that, but keep it in the back of your mind.