Here at Party Fairy, we work with all kinds of artisans, producers and party-people. Since they’re experts in what they do, they know best what it takes to get what you need in your hands. That’s why we leave it to each seller to set the shipping fees and policies.
So, to answer your question, it really depends on the individual seller and the logistics partner he might be using. Some sellers and logistic companies, like SingPost, do not deliver on Sundays.
Meanwhile, there are others that can deliver on weekends and public holidays. If the vendor/logistics company is able to do so, you would be able to select so on the checkout page.
If you have any uncertainties, we highly advise you to contact the vendor directly.