You can participate as a session organizer.
Procedure
The special session must focus on actual or possible applications of nontrivial computer algebra techniques to some other field or focus on some substantial interaction of computer algebra with some other field.
A special session is 3 hours long with a short break in the middle. Two typical formats are: 6 talks of 1/2 hour each; or one talk of one hour and 4 talks of 1/2 hour each. The allocated time includes questions and discussions.
At this point there is no funding for this meeting although outside funding is being sought. Thus all organizers and attendees are responsible for all of their expenses unless the organizers are able to obtain outside funding.
Conference programs
The following documents give you some idea about various possibilities.