The party was for a victim of an April killing, the 4th month, on an unspecified date.
This story comes on a date with 19 numerology, December 22, 2019.
12/12/2019 = 1+2+2+2+2+0+1+9 = 19
As for it happening at the 35th minute of the day, that connects to 'Chicago', the city known for shootings.
And the 5700 block?
And Fred Waller?
Freemasonry = 58; Fraternal = 58
Masonry = 33
The 13 shot is likely a tribute to Illinois.