I think the Kennedy Center in DC is a prime target. No security, high value name recognition target, in the Capitol city, lots of people including your groups and very easy access. I easily can see an Oct. 7 event there.
your groups should be tour groups.
There are thousands of targets, and as we saw in Boulder on Sunday these people are utterly depraved.
If you look at the recent so-called “lone wolf” attacks in DC and Boulder, there does seem to be correlation with blue districts and other places where the likelihood of encountering armed civilians is reduced.