From what I've seen, al Qaeda proper seems to be mostly hunkered down in safe houses watching old videos of themselves on TV.
We do have a recent history of mass shootings by individuals inspired by al Qaeda. Not very many, but a few.
For that reason, those who are legally able to carry concealed, who will be near big public events where carry is possible and a firearm can be WELL controlled (and by this I mean kept out of the reach of children and others who might gain access - I wouldn't want to inspire a 4th of July accident) - such people may find this weekend a suitable one to be responsibly prepared.
True. I was wrong on another count- it is impossible to prove a negative- I do not know why we have not had any major attacks since 9/11.