If I create a profile application and registration forms for events.
how can I make the link between Seblod presentation pages and registration forms for events?
-- basically you need 2 content type (event and participant) with a field that 'act' as foreign key i highly suggest a hidden field for this
Can I automatically display the entries in the users profiles?
-- yes
will Seblod allow me to manage the registration history ?
-- yes
what do you use to integrate payments in Seblod?
-- as for now, there is none, but there will be ecommerce add on, the one that we are using now when we buy seblod add on