There are three types of symposia permissions - Public, Private and Admin only
Private - can be created by anyone, only abstract submitters who are invited by the symposium creator can submit. See also Submitting to a Private Symposium.
Admin only - can only be created by an administrator, with abstracts submitted by anyone. See Creating Symposium (as an Administrator).
Creating a private symposium
Follow the link to the form supplied by the administrator. You will be asked one of the three options below. Select the relevant choice.
If you select the 1st or 3rd button, you will be taken to the symposium form. (For the 2nd choice, see Submitting to a Public Symposium)
Complete all the fields in the form. Note that mandatory questions are denoted with a *. At the bottom of the form, there is a field for entering the email addresses of those you wish to submit to your symposium.
Follow the instructions and press 'submit'.
Your symposium will now be available for those you have invited to submit to your symposium.