Hi there, Cathy! Welcome to the Disney Parks Moms Panel and thanks for your question!
It's so exciting that you will be visiting the Happiest Place on Earth this weekend! You must be brimming with excitement. When you
purchase regular multi-day theme park tickets, there are not any associated black out dates. So you can absolutely purchase a three-day ticket and use it this Memorial Day weekend. Keep in mind that you must use all three days of your ticket within 13 days of the first use, but they do not have to be consecutive. All tickets are always subject to park capacity which means that if the crowds at the park reach capacity, they cannot allow any additional person to enter, even if they have a valid ticket. But this only happens very rarely. The only other restriction is that any multi-day tickets purchased right now must be used before January 13, 2020.
An important bonus when you purchase a three-day or longer theme park ticket is that you will have one
Magic Morning entitlement. Magic Morning allows Guests to enter Disneyland Park one hour before general admission on a Tuesday, Thursday, or a Saturday. I wholeheartedly recommend taking advantage of Magic Morning! Getting into the park early allows you to ride many attractions with minimal waiting since the crowds will be low. Arrive at the park gates about 30 minutes prior to when the park opens for Magic Morning and you'll discover how glorious it is to tour Disneyland Park in the early morning.
I hope this information was helpful. Have a magnificent time at the Disneyland Resort!
-Linda