Seeking temporary home for 2 cats

I wonder how old they are, male/ female? Personally, we would have to lodge them in a cattery for 3 weeks during the Summer. Also, we already have a cat -which they might not like - and we are grieveing for our old cat who died recently - so we could fall in love with them! Perhaps you could clarify on these Q's

There is an open day at Cat Rescue avenue de Mai, 216 in 1200 Brussels on Saturday 21st and Sunday 22nd of April from 1 pm to 6 pm. There are loads of cat lovers attending and some care for cats, if you visit, you could meet some of these people and they would probably know of a good foster home that could take care of your kitties. All the members have adopted cats and most people who will be going there love cats and do not do it just for the money.