The webpage for the sci-fi-themed "Knox Robinson Coalescence" includes a link to the couple's online wedding registry, which states that Knox and Robinson are "asking for help" so that they can put on the "best party ever" for their friends and family.
Those who donate towards the registry can choose to gift the couple between $25 (£20) and $10,000 (£8,036), in exchange for gifts including shout-outs on the dance floor or, for the most generous donors, a video message "from the future".
The couple state that they had to spend their wedding funds on a recent trip to Italy, when Knox was invited to speak at an event for non-profit organisation the Italy Innocence Project.
I'm getting married to @manunderbridge ! How? Oh so weirdly! Time travel & so forth. Check out our wedding story: https://t.co/X5gVsyWTyS …
We're still figuring out our crazy costumes, sets, props, and food. Fashionistas? Prop wizards? Chefs? Got any advice? I'm all ears!— Amanda Knox (@amandaknox)July 20, 2019
Several people have expressed their opposition to Knox and Robinson's registry, describing it as "shameless".
Nonetheless, Knox has hit back at the criticism she's received, stating that those who have aired their disapproving views have been "duped by the outrage machine".
To those hating on us all day, you've been duped by the outrage machine. You gave ad $ to tabloids that profit by making you angry about things that don't matter. Our wedding will be crazy & fun & barebones if it needs to be, but in the grand scheme of things, it doesn't matter.— Amanda Knox (@amandaknox)July 23, 2019
"To those hating on us all day, you've been duped by the outrage machine," Knox tweeted.
"You gave [advertisement money] to tabloids that profit by making you angry about things that don't matter."
Knox added that her wedding to Robinson doesn't require donations, stating that it will be "crazy and fun and barebones if it needs to be, but in the grand scheme of things, it doesn't matter".
Earlier this year, a couple who crowdfunded for their wedding denied they were "money grabbing people" after experiencing an online backlash.
Fundraising website Crowdfunder has a specific page on its website for people attempting to raise money in aid of their nuptials.
Last month, Knox spoke at a panel during a conference on criminal justice in Italy.
The American accused the media of portraying her as a "cunning, psychopathic, dirty, drugged-up whore who was guilty until proven otherwise".
In November 2007, Knox's British roommate Meredith Kercher was found dead by police in the flat that they shared in Perugia, Italy.
Knox and her then-boyfriend, Raffaele Sollecito, were found guilty of murder and sexual assault in 2009.
Two years, later, the pair's convictions were overturned following an appeal and they were released. Knox had served almost four years in prison.
Knox was re-convicted in January 2014 following a hearing, before being cleared by Italy's supreme court in 2015.
In January, the Italian government was ordered to pay Knox £16,000 in damages.