Hi, the formatting in the comments is difficult to understand, so I will add my comments and explanations for my corrections here:

1) "Last entry written by me" = "The last entry that I wrote" -

This is two different changes. The first is that in English we always specify the noun with an article, using either "the" or "a". Especially in writing, we would say "the entry" or "an entry". Since you are referring to a specific entry, you would use "the."  The second change is difficult to explain, simply because it comes down to normal English usage versus other languages.

Technically what you wrote is correct, but it is not something a native-speaker would say. It is not common for us to use the format "[verb]ed by [someone]", such as you wrote "written by me", or for more examples we would never say "the picture painted by Michelle" or "the chair sat on by me". This is what we call "passive voice", and it usually sounds a little awkward to a native ear. Instead, we would use the "active voice", which would be (using the previous examples): "The entry that I wrote", or "the picture that Michelle painted", or "the chair that I sat on". The structure that we would use follows the structure: " [noun] that [someone] [verb past tense]" .

Also, just as a final note, it is very common, especially in spoken English, for speakers to drop the "that", and instead simply say "The last entry I wrote", or "the picture Michelle painted, or "the chair I sat on".

2) I moved the phrase "a family party" earlier in the sentence to make it easier to understand. Try to keep each "unit" of the sentence together, such as "when I organise a family party" and "together with mummy and daddy". Before you had placed "together with mummy and daddy" inside the 'unit' that is "when I organise a family party".

I tried to explain the corrections in detail so that you can learn and understand the grammar rules. For you these are more advanced rules, so don't worry if they are difficult to understand, sometimes even native English speakers have trouble with these! :)  I hope this was helpful, and if you have any questions you can message me and I will be glad to help you more! Great job and I wish you a Merry Christmas with your family!

Christmas - part 1

Hello there,

I trust you are well and had a great weekend!

Last entry written by me, The last entry that I wrote wasn't corrected by anyone. There are three posibilities of such a situation:

Possibility 1- more plausible - my English is impeccable and you had nothing to correct.
Possibility 2 - implausible - my entries are so boring that you cannot stand reading it.
Possibility 3 - you do not like Paris Hilton and the title scared you.

On this occasion, I would like to convey thanks, from the bottom of my heart for the people who corrected my previous entries. I would like to let you know that all your advice are invaluable for me.

With regard to the fact that Christmas is comming, I decided to write only about Christmas and Polish traditions for a few weeks. I strongly believe that you will find this topic interesting and it will encourage you to read it.

I am a very lucky person, who is a member of really big family. When I organise a family party, together with my mummy and daddy a family party, I am always responsible for helping in cooking meals, supporting my dad with all the cleaning activities and preparing the table. When the family comes, we spend the entire day eating and talking at the table. I have to confess that when I was younger I didn't enjoy spending time with the whole family but now, when I am a little older I like it and it is not boring for me any more.

Yesterday, I started all prep work for Christmas. When you have a big family, you have to dedicate much time for buying gifts for your relatives. I love buying on the Internet. I Poland we have one portal, using which you can buy literally everything, much cheaper than at the shops. I spent whole Saturday looking for gifts and other useful gadgets for Christmas such as: covers with Santa for cutlery and pillows and decorations for cakes.

I have a gut feeling that this Christmas will be outstanding :)

To be continued ...