Hey there Chocka,
Welcome to planDisney and thank you for your question! It looks like your visit to the Disneyland Resort is coming up in just a few short weeks - it'll be here before you know it!
At this time, there is no option for a partial day
theme park ticket. Theme park tickets grant entry into either Disneyland Park or Disney California Adventure Park - depending on your
theme park reservation - and you're able to access the park and all it entails (including parades!) within the park hours for that day.
Additionally, you can purchase the
Park Hopper option so that you can begin hopping between the two parks starting at 11:00 AM. This adds quite a bit of flexibility and convenience to your visit to help you see and do everything that you want during your trip.
Therefore, if there is a particular parade that you'd like to catch, I would recommend purchasing at least a standard 1-day park ticket to make sure you can view it and then spend the rest of your time enjoying everything else that comes with a visit to the Happiest Place on Earth!
Thanks again for your question, Chocka. I hope you have a fun time on your upcoming vacation.
Have a Magical Day,
Greg