private void addStaffToEvent() {
int staffSize = toListModel.size();
if(staffSize < 1) return;
Object[] staffIds = new Object[staffSize];
for(int i = 0; i < staffSize; i++) {
Staff staff = (Staff) toListModel.getElementAt(i);
staffIds[i] = staff.getId();
}
event.addStaffs(staffIds);
}