Question: can ceviche be made the night before?
Answer: Ceviche is not a make-ahead dish, at least not if you like yours on the firmer side. If you like it flakier, you can marinade for longer and then it is a natural make ahead option. Instead, to do make-ahead ceviche, you can get everything ready ahead of time. Slice your fish and get it back on ice in the fridge.