Hi,
As is "unwanted attention", even if verbal, and "sustained disruption, interruption", which would be applicable if people are continually interrupting your talk on purpose (similar to the "background conversation" note, though not the same thing).
Right - I got the sense from the original description that people were talking among themselves just because they thought what the speaker was saying was unimportant, not in an attempt to disrupt the speaker. (Though background chatter is always disruptive, and a pet peeve of mine, but that's another story.) I still contend that, for what it's worth, many of the reasons Risker offered for why a young woman might be afraid to attend Wikimedia events would still be valid even after a code of conduct was adopted and enforced. (Though the most egregious ones would be handled.)
-Yaron