It's best to unpack your succulents on arrival and place them in a warm, well-lit area. They require light and water.
If your event is still a few days off, it's best to unbox the succulents and place them in a warm, well-lit area until then. They require light and shouldn't remain packed for too long after arrival.
If the event is more than a week away, besides unpacking them, make sure to water them enough that water drains from the hole in the base of the pot. Never leave them in standing water. Keep your succulents away from temperatures below 50°F or above 100°F to maintain best health.