If somebody was asking me to spend significant money for a tournament, I would be trying to help in any way I could and finding officials to recommend is an easy way to help. Most tournament directors have a shortage of people willing to officiate as well as problems like dropouts etc. Most would appreciate recommendations of good names. The second would be to ask before you pay for a tournament how the officials are being selected. If they are not being chosen in a manner that fits your idea of professionalism, don't go to that tournament.
Most teams play too many tournament games anyway.
A few more scrimmages would be good for them. The third thing you could do would be to set an example by running your own tournament. Many private schools have people that can get you a gym for free or next to nothing. With a typical twelve parents on a team, you should be able to run a tournament without too much trouble. The most important thing you can do however is to remind your players that when they play pickup with their friends that they don't have referees and the game is very seldom stopped for foul calls.