Today's surprise: they were 5,000 to 10,000 thousand (my guess, I have not heard media numbers although their description jibes with this). These are not small demonstrations, folks. And there were a number of other events going on elsewhere at the time.
Other midsize marches included a Poor Peoples' March from the UN to an area near to the Convention Area (but shunted off to a side location) and a march of Veterans protesting cuts in their after-service benefits.
2) While the Convention area itself is in a frozen zone, efforts have been made to make an whole are of the west side of mid-town Manhattan (through the area of hotels off of 5th avenue) inhospitable to protestors. Heavily armed anti-terrorist guards have been prominently placed in much of the area often carefully twinned with double ranks of fully laden riot police. A large urban area is eerily empty, locals have fled and the police presence scares off dawdlers. The Conventioneers presence would be striking regardless, as they stand out so clearly as non-New Yorkers. But, as they stride in large numbers through the Theater and Restaurant district, with the step of those used to some affluence and command, the survey the empty scene and the occasional hemmed in protestors surrounded by riot police almost with the air of an occupation. Yet they appear strangely amicable replacements for the native New Yorkers.
Witnesses (not covered much in the media) that are not even sympathetic to the tactics of the Times Square protesters repeatedly report 'sweep tactics' against those engaged in entirely legal protest, and sometimes netting non-participating by standers (sometimes literally netting, since nets were used). The City is clearly determined not to allow these demonstrators to spoil the Conventioneers 'atmosphere', regardless of how legal is their presence. This, along with the detentions of those held by the police (NY requires the appearance before a judge within 24 hours) is likely to be the subject of future legal action.
Today is said to be largely small civil disobiedience groups, plus a march by the War Resisters League. (But first the rain must lift).
Paul