9:55 AM PT -- Offsetwas scheduled to perform at MGM Music Hall in Boston tomorrow, but an employee at the venue says that's no longer happening due to Takeoff's passing. We're told the event will still go on as planned, but Offset won't be there.
Offset has yet to speak out about the loss of his Migos brother Takeoff ... but the rapper is paying tribute to his friend and family member through his social media profile.
Offset's Instagram page changed avatars Wednesday morning -- it now shows a picture of Takeoff smiling for the camera with a heart emoji.
Clearly, Offset's still reeling from Tuesday's fatal shooting ... although the artist hasn't joined the flood of friends and fans in posting about the loss of Takeoff.
As we reported, Takeoff was with fellow Migos member, Quavo, around 2:30 AM Tuesday -- Quavo was in a heated discussion with an unknown group of guys before someone in the crowd opened fire.
TMZ obtained this video -- a new angle of what went down only seconds prior to the gunfire -- and you can see a man dressed in black, with a handgun in his right hip pocket.
While nothing in the video proves the man fired the first shot, there is a point where he's seen raising his weapon and seemingly firing it -- but it's unclear if his weapon was pointed in the direction of Takeoff or Quavo.