please also note: regarding retreat , we have some ways for you to attend for discounts, 

1, if you invite someone NEW, to the retreat; you will both save $100.00 or 90 euro                                                               . 2,If you bring 3 NEW people you can pay 1/2 price of the retreat.                                                                                                3, If you bring 4 or more NEW people to the retreat you may attend for no charge.  
2, a special discount if retreat is paid in full in advance save US $80.00. or 72 euro. 
Single room : additional cost U.S.$500.00 or 450 euro