I've had a look, and I'm afraid I don't think this is possible.

You should be able to query by the following things: search_text, location, place_id, country_d,state_id, metro_id, venue_id, woeid, category_id, min_date, max_date and tags.

The closest thing I can get to is scraping their site:

select * from html where url='http://upcoming.yahoo.com/user/16325/' and xpath='//tr[@class="vevent"]'

Right now though you won't be able to use that in an IN statement but you could parse it out on your side and pass the events in as a literal list.

Sam

thanx alot

I just wanted to let you know that we released a new YQL version which supports finding upcoming.events by user_id as you had requested.
Thanks again for your feedback!

-- Nagesh

Though I didn't post it I am going to use it...
So thanks!