The registration link (to actually register for the conference) just goes to a page that uses an iframe to wrap the real registration site, provided by a vendor.
There are a couple of configuration items that need to be agreed with the vendor each year, a shared secret and a URL. These should then be configured using the admin in the constance app. Go to /YEAR/admin/constance/config/ and set CTE_SECRET to this year’s shared secret and REGISTRATION_URL to this year’s URL.
When ready to open up registration, make sure the vendor is ready, then put a link on the front page that goes to the URL named “registration_login”, e.g.:
<a href="{% url 'registration_login' %}">Register!</a>