Hi I have created special content type called Event. It is simillar to facebook events. It has description, address where it will be held and date when it will be held. I succesfully added there registration form with Entity registration. So now I can register to one event. But I want to be able to register from one event to more events like this.
In event detail, registration form section, I want to have checkboxes. When I click on these checkboxes and click on register to event, it will register me to every clicked event, and to opened event too. These additional event, I will select in administration, when creating new event.