Hi Carlos,
Unfortunately, this is not possible to do in SAP Jam today. You could use the API to create the Events and Tasks or alternatively - if you need to provide a user interface to the end user - create, and embed, an OpenSocial gadget, that uses the API, to create the Events and Tasks.
The Developer Guide contains the API Reference and details regarding OpenSocial - SAP Jam Developer Guide.
Thanks,
James