I'm using Solspace's Calendar module to assign multiple dates to entries and I need the option to search through these entries by date using the Solspace Supersearch module, i've not come accross any docs on this. If I look at the field in the exp_channel_data table its just assigning the id of the calendar being used. Thanks!
This is not possible out-of-the-box, but there is a workaround:
Depending on how exactly you plan to search for Calendar events, you could use the Solspace Preparse add-on. What you could do is create a new field that is used to parse the calendar data in a plain string text value (you could format the date however you please).
The Preparse field will populate data (in this case from Calendar) after you publish/update the entry, and insert whatever data you've told it to (using a regular EE template) back into your Preparse field for the entry. That would mean you then have a field that is searchable by Super Search. :)
You could then attempt to run a range (from/to) search on it in your search form.