Vi skriver datoen i kalenderen, så ingen glemmer mødet i næste måned.

Because skriver is the present tense form of the verb at skrive.

In Danish, verbs do not change according to the subject the way they do in English. So:

• jeg skriver = I write / I am writing
• du skriver = you write
• vi skriver = we write

The infinitive is at skrive = to write, but after a subject like vi, you use the finite verb form: skriver.

The ending -en is the usual way to make a definite singular noun in Danish for many common-gender nouns.

So:

• en dato = a date
• datoen = the date

and

• en kalender = a calendar
• kalenderen = the calendar

Unlike English, Danish often adds the definite article to the end of the noun instead of using a separate word like the.

Because møde is a neuter noun, not a common-gender noun.

In Danish singular definite forms:

• common gender often takes -en
• neuter often takes -et

So:

• et møde = a meeting
• mødet = the meeting

That is why you get datoen, kalenderen, but mødet.

Here så means so or so that.

In this sentence:

• Vi skriver datoen i kalenderen, så ingen glemmer mødet
  = We write the date in the calendar, so that no one forgets the meeting.

It introduces the result/purpose of the first action.

Be careful: så can also mean other things in Danish depending on context, such as then, so, or very, but here it is clearly the conjunction meaning so / so that.

Because ingen is the subject of that clause.

• ingen = no one / nobody
• glemmer = forgets

So ingen glemmer mødet literally means no one forgets the meeting.

This word order is normal because after så here, you have a clause where the subject comes before the verb.

Ingen means no one, nobody, or sometimes none, depending on context.

In this sentence:

• ingen glemmer mødet = no one forgets the meeting

It is a very common word, and it can be used with both people and things depending on the sentence.

For example:

• Ingen kommer = No one is coming
• Ingen problemer = No problems

Because in Danish, time expressions like next week, next month, and next year usually do not need an article.

So:

• i næste måned = next month / in the next month
• i næste uge = next week
• næste år = next year

This is similar to English, where we also usually say next month, not the next month, unless we mean something more specific.

Because i is a very common preposition in Danish, and like English in, it can be used for both place and time.

Here it has two different uses:

• i kalenderen = in the calendar
• i næste måned = in/next month

So the same preposition can work in more than one type of expression.

Because Danish normally uses commas to separate clauses more regularly than English does.

Here you have:

• main clause: Vi skriver datoen i kalenderen
• following clause: så ingen glemmer mødet i næste måned

The comma helps show the boundary between the two parts of the sentence.

Danish comma rules can feel a bit more systematic than English comma rules, so learners often notice commas appearing in places where English may or may not use them.

Either can work, depending on context.

Danish present tense often covers both:

• we write
• we are writing

So Vi skriver datoen i kalenderen could mean:

• We write the date in the calendar
• We are writing the date in the calendar

English chooses between simple present and present progressive more often than Danish does.

It is singular because the sentence is talking about one specific date: the date of the meeting.

• datoen = the date

If you wanted plural, you would need a different form, for example:

• datoer = dates
• datoerne = the dates

But in this sentence, one meeting normally has one relevant date, so singular makes sense.

The basic structure is:

• Vi = subject
• skriver = verb
• datoen = object
• i kalenderen = place expression
• så ingen glemmer mødet i næste måned = result/purpose clause

So the first part is:

• Vi skriver datoen i kalenderen
  = We write the date in the calendar

Then the second part explains why or with what result:

• så ingen glemmer mødet i næste måned
  = so that no one forgets the meeting next month

This is a very natural and useful sentence pattern in Danish.