Theme : Esperanto 10b - Belgian postcards

In my previous post on the Esperanto postcards, I spoke of a set of 20 different cards.
This is what I presume, as i have card n°20. But after a bit of search, I found that there must be at least 24 cards. Unfortunatly I don't have all the cards in this set.

In the first post, I showed some of the animation around the 7th International congress of Esperanto, that was held in the Belgian city 'Antwerp' (or : Antverpeno, in Esperanto).

Apparently there was a kind of cinderella stamp in use to promote the 7th International Congress.
I don't have that stamp in my collection, but I found it in the internet and I'm sharing it with you.

cinderella to promote the Esperanto congress - not in my posession

Well, back to the postcards...
There are many missing in my collection, but I'm sharing those I have.

Group photo after the Red Cross Performance - Card 4

card 13 - during the congress

View of the Gerneral  Assembly in the big hall of the Royal Zoological Garden in Antwerp

Card 20 - gathering after the convention with the international guests

Anyone who can provide me the other cards in this set, please contact me.