At the meetup at today, you would not have seen much in the way of potential infiltrators ... I mean, you really don't have to worry to much about antifa, they are all wrecked and confused people anyhow. At Sunray there are nothing but crusty looking wiggers, Blacks and Hispanics.
That said, it's true that some caution must be taken with giving full details. Just find a meetup place, don't use real names, use common sense. It's refreshing to talk openly.