It will be done with a Ghost Gun AR-15 with a bump-stock and a 100 round magazine. The gun will be acquired by exploiting the gun show loophole. This gun will be wielded by a MAGA-cap wearing, older white male who recently posted about being opposed to the Global Warming agenda, the transexual agenda, and Big Technology censorship. He will have attended the January 6th sedition/terrorism/revolt/riot/attempted coup/rebellion/insurrection, and believes the untrue lies (that have been disproven) that there was any widespread voter fraud in 2020, even though there is no credible evidence, and following the fact that this fabricated and false accusation has been debunked as falsehood, and is unfounded, lacking evidence, and all such charges have been dismissed and proven to be without merit, substance, or any modicum of truth.
Your post has so many details correct that the only way you could know all that is if you are in on the plot.
My suggestion: give your worst enemy your cell phone.
;-)
A real Smörgåsbord.