Hello Mary,
Each comp here in the USA has a different format depending on what the organizers of the comp want to do. Some are all Pro-Am and some have both Pro-Am and all amateur couples, youth and senior catagories, etc. with a few demos by pro couples. Typically the Pro-Am catagories are for students who have not found a full time dance partner yet but who want to compete. So the student enters the comp with his or her dance instructor as partner. Doing the Pro-Am is all voluntary and up to the student and teacher to work things out and to prepare months or weeks before the comp dates.
Some studios encourage and or expect their instructors to enter into Pro-Am more so than others, again this varies widely by studio and owner.
I do not understand what you mean by: "little couples consisting of two students, and teachers have to fill the gaps."
For the most part anyone can compete or enter comps according to their skill and experience level. College students are attracted where the school they attend has a good dance arts program. For working adults generally the people with higher paying jobs, or those who are retired go out for comps. Since private lessons and the gowns and costumes cost a lot of money and time.
Some studios organize their own comps. other comps are invitationals, open to all who qualify.
Dance lessons are taught in 5 major catagories:
1 Private lessons at a studio, 45-60 minutes by 1 instructor and 1 student or one couple.
2 Group classes at a studio of 4-6 sessions over successive weeks with 1 instructor who sometimes has a demo partner and 20-40 students in a circle, for 30-60 minutes per dance.
3 Party lesson held before the dance party at a studio on Fri, Sat, or Sun night given by 1 instuctor who sometimes has a demo partner and a large group of dancers their for the party, anywhere form 50-150 in a circle depending on the size of the studio.
4 Workshop lessons given by a celebrity or in demand teacher, usually with a demo partner to a small group of students 10-50 for 1-2 hours per dance.
These are frequently on a Sat or Sun afternoon.
5 Dance camp, like a boot camp, which can be anywhere from 1 day long to 2 weeks long, usually 5 days long. A dance camp is usually an annual event held in a meeting hall at a hotel and dancers come from all over the country and even foreign countries to attend, and stay in a hotel or college dorm. The dance camp organizers will bring in several celebrity teachers and or winning pro competitors to teach the classes which will go in 1 hours slots from 9am-5pm each day and there can be 1 or 2 or 3 classes going on at the same time so the studets have to choose which class to attend each hour. The other teachers not giving a class at that time will give private lessons by appointment. Usually there is a party dance after the dinner break for the students to practice every evening. And usually there is a comp on the last evening of the dance camp. There will be shops that come in for the dance camp and have tables to sell their shoes, gowns, clothes, jewelry, etc.
A good teacher would master the bronze, silver, and gold syllabus for a particular dance or dances and would give private lessons on a regular weekly basis to their students. And typically the popular teachers at a studio will also give the intermediate group classes and the party lessons on the intermediate party nights.
Regards,
DancinChicagoGuy