Tasha's Raging Mansion

You conjure an extradimensional dwelling in range that lasts for the duration. You choose where its one entrance is located. The entrance shimmers faintly and is 5 feet wide and 10 feet tall. You and any creature you designate when you cast the spell can enter the extradimensional dwelling as long as the portal remains open. You can open or close the portal if you are within 30 feet of it. While closed, the portal is invisible.  Though invisible, a loud low base thrums in rapid pulses within 30ft.

Beyond the portal is a twisted mansion with illusions of fey and fiends partying in the central hall, with numerous chambers beyond. The atmosphere is dark, loud, and uncomfortably warm.  The main floor contains 1d4 Pit fiends and 1d4 Balor that will continue to party while listening to the band.  They will not directly attack guests, but will attempt slam attacks on anyone entering the center of the room.  The band plays loud metallic music in discordant fashions, requiring a CON save at the spellcaster's DC if a guest draws within 40 ft.  Upon success, target takes half damage and is not deafened.  On a failure, target is takes 4d4 bludgeoning damage and is deafened until after a long rest.  Failure by more than five results in being stunned and slammed by the Pit Fiends and Balor in attendance.  In the central room, one can only hear normal speech within a 5ft radius.  Audible spells such as message automatically fail.  Sending has a fifty percent chance of success.  Any creature attempting to scry on a guest must make a CON save equal to the spellcaster's DC; or suffer the effects of the bludgeoning damage and deafness.  Scryer is also stunned if they fail the save by more than 5.  Additionally, attempting to scry on guests summons 1d4 Pit Fiends and 1d4 Balor to the scryer's location in open spaces, who immediately react with hostility due to being taken out of their party.  They return within one minute or ten rounds.

You can create any floor plan you like, but the space can’t exceed 100 cubes, each cube being 10 feet on each side. The place is furnished and decorated as you choose so long as the choice is dark and dangerous. It contains sufficient food to serve a nine-course banquet for up to 100 people. All food is poisoned (Dm's choice of poisons from the poison table); and drinks are concentrated evocation spells ranging from level 3 to 7 of Dm's choice.  Any malicious spell in a contained in a drink has the range of self.  A staff of 100 semi-transparent incubi and succubae attend all who enter. They are completely disobedient to your orders, requiring deception, intimidation, or persuasion checks to influence. Each servant can perform any task a normal human servant could perform, and can use the monster templates to charm, attack, or assist a guest. Thus the servants can fetch things, clean, mend, fold clothes, light fires, serve food, pour wine, and so on. The servants can go anywhere in the mansion but can’t leave it. Furnishings and other objects created by this spell dissipate into smoke if removed from the mansion. When the spell ends, any creatures or objects left inside the extradimensional space are expelled into the open spaces nearest to the entrance.