We have but it has taked awhile to get the right formula. Here are a few suggestions:

-Make sure you go to cities that are big enough to support your seminar - the first few preferably should be in your home city to save on costs and you are obviously you are familiar with the area

-It is hard to make a ton of money on just seminars - have books, training packets and other things you can sell for additional dollars at the back of the room

-Do split testing on any advertisements for your seminars to find out which one is most effective