Is there any importance for the night preceding Eid? Some people say the night before Eid is “lailatul jaaizah” and they stay awake in worship like how they stay awake during the odd nights of Ramadan.
No this is an Innovation (Bida). Do not specify Laylat al Eid with any worship except if it is your regular worship, like if you pray Qiyam Layl every night. In Laylat al Eid we thank Allah for completing Ramadan and we make takbir and takbir ends with the Eid prayer.