A good question.
A local answer.

Keep a second city day for museums or lakeside walks rather than assuming the festival requires a second full entry.

Check whether attraction entry or guided tours are included, and whether you will have free time for lunch.

Check the current event's official parking and access map, because temporary closures can change the best approach.

Check current opening hours, especially on a Sunday or public holiday, before building the day around a specific street.

Check the weather and equipment status before a long drive. Bring water and a change of clothes if the park has water play.

Choose a base that keeps meals and children's downtime easy, even if it is not directly beside the flowers.

Allow for a long drive, possible chain requirements and warm waterproof clothing. Check resort and road rules before departure.

Reserve an Easter meal in advance and keep a supermarket or hotel dining fallback.

Confirm the coach's current departure point before booking. A hotel that looks close to the old stop may still require a long walk with bags.

Check the current daily program and weather before choosing the time; a talk or performance may make one period more appealing.

Check whether the restaurant offers a set menu, how long the meal takes and its cancellation terms before booking.

Check the festival's current accessibility map, seating, accessible transport and mobility equipment before choosing a date.