What lido deck? Been on 4 Celebrity cruises and have never seen or heard of a Lido deck. There is alternative dining in the evening at the Buffet area that you can call down to guest services and make a reservation for. The menu is somewhat limited and not the same as the main didning room. It is full service dining and they do a wonderful job. Those waiters are not included in the gratuity paments at the end of the cruise so you really should tip them. Celebrity recommends 2.00 per person. I always left 5.00 or 6 dollars for the 2 of us because they do such a wonderful job. You can charge the tip to your cabin or just pay them in cash. I also tipped the maitre d' because some nights we just walked up without a reservation whent hey were busy and he gladly seated us with no wait.