كل من ورشة العمل وجلسة الأسئلة والأجوبة في برنامج المؤتمر.

كل من X وY is a very common pattern meaning both X and Y.

So:

• كل من ورشة العمل وجلسة الأسئلة والأجوبة
  = both the workshop and the question-and-answer session

Even though كل often means every or all, in this pattern it specifically means both when two items are joined by و.

In Arabic, present-tense sentences often do not use a verb like is/are.

So:

• ورشة العمل في برنامج المؤتمر literally: the workshop in the conference program naturally means: the workshop is in the conference program

Likewise:

• كل من ورشة العمل وجلسة الأسئلة والأجوبة في برنامج المؤتمر means: Both the workshop and the question-and-answer session are in the conference program.

This is a normal nominal sentence in Arabic.

It can be understood as a full sentence in Arabic:

• كل من ورشة العمل وجلسة الأسئلة والأجوبة = the subject
• في برنامج المؤتمر = the predicate / comment about the subject

So the whole thing means:

• Both the workshop and the question-and-answer session are in the conference program.

That said, depending on context, it could also appear as a short standalone line in a schedule or description, where Arabic often allows very compact wording.

ورشة العمل is an iḍāfa construction, often called a construct phrase.

It is made of:

• ورشة = workshop
• العمل = the work

But together ورشة العمل means the workshop or more literally the work workshop, which is simply the standard Arabic expression for workshop.

A few important points about iḍāfa:

• The first noun usually does not take ال
• The second noun can make the whole phrase definite
• So ورشة العمل is definite and means the workshop

This is why you do not say الورشة العمل here.

This is also an iḍāfa structure:

• جلسة = session
• الأسئلة = the questions
• الأجوبة = the answers

So:

• جلسة الأسئلة والأجوبة = the session of questions and answers = the Q&A session

Inside it, الأسئلة والأجوبة means the questions and answers.

So the full phrase is literally:

• session [of] the questions and the answers

but in natural English we usually say Q&A session or question-and-answer session.

Because they are both definite nouns here:

• الأسئلة = the questions
• الأجوبة = the answers

In Arabic, when two coordinated nouns are definite, each one normally keeps its own الـ:

• الأسئلة والأجوبة
• literally: the questions and the answers

Arabic does not usually let one الـ cover both nouns the way English sometimes lets the apply to a whole phrase.

Word by word:

• في = in
• برنامج = program
• المؤتمر = the conference

So:

• برنامج المؤتمر = the conference program

This is another iḍāfa construction:

• برنامج = program
• المؤتمر = the conference

Literally it is program of the conference, but natural English is the conference program.

Then:

• في برنامج المؤتمر = in the conference program

Because in an iḍāfa construction, the first noun usually does not take الـ.

So:

• برنامج المؤتمر = the conference program
• not البرنامج المؤتمر

The definiteness comes from the second noun:

• المؤتمر is definite
• therefore the whole phrase برنامج المؤتمر becomes definite

This is one of the most important patterns in Arabic noun phrases.

In the pattern كل من X وY, the word من helps introduce the items being grouped.

So the structure is:

• كل من X وY
• literally something like each/all of X and Y
• idiomatically: both X and Y

You should learn this as a set expression, because it is very common in formal Arabic.

Examples:

• كل من المدير والموظف = both the manager and the employee
• كل من الكتاب والمقالة = both the book and the article

Yes. In fully vocalized formal Arabic, you could write:

كُلٌّ مِنْ وَرْشَةِ العَمَلِ وَجَلْسَةِ الأَسْئِلَةِ وَالأَجْوِبَةِ فِي بَرْنَامَجِ المُؤْتَمَرِ.

A few notes:

• كلٌّ can be nominative here as the beginning of the subject
• After من, the following nouns are in the genitive, so:
  • ورشةِ
  • جلسةِ
• In the iḍāfa phrases, the second nouns are also genitive:
  • العملِ
  • الأسئلةِ
  • الأجوبةِ
  • المؤتمرِ

In everyday printed Arabic, these endings are usually not written, so learners mainly need to recognize the structure.

Because the sentence is not simply saying the two things as one dual noun. Instead, it is listing two separate items and linking them with و inside the pattern كل من ... و....

So Arabic says:

• كل من ورشة العمل وجلسة الأسئلة والأجوبة = both the workshop and the Q&A session

The dual is used when the noun itself has a dual form, such as:

• كتابان = two books
• جلستان = two sessions

But here we have two different nouns, so the coordination pattern is the natural choice.

Yes. Some alternatives are possible, depending on style:

• ورشة العمل وجلسة الأسئلة والأجوبة في برنامج المؤتمر = The workshop and the Q&A session are in the conference program

This is a little more direct.

• تتضمن برنامج المؤتمر ورشةَ العمل وجلسةَ الأسئلة والأجوبة = The conference program includes the workshop and the Q&A session

This version uses a verb and sounds a bit more explicit.

Using كل من ... و... gives a somewhat formal, organized tone, which fits conference-related language well.