jeoneun damdangjawa haengsajangeseo hyeopryeokhaeyo.

저는 is 저 + 는.

• 저 = I (humble/polite way to say I)
• 는 = topic marker

So 저는 means something like as for me or I as the topic of the sentence.

A native English speaker often expects just a subject, but Korean often marks the topic instead. In many everyday sentences, 는 helps set up what the sentence is about.

Both can mean I, but the tone is different.

• 저는 = polite/humble
• 나는 = casual/plain

Since the verb ends in -해요, which is polite speech, 저는 matches that politeness level naturally.

So:

• 저는 담당자와 행사장에서 협력해요. → polite
• 나는 담당자와 행사장에서 협력해. → casual

Mixing 나는 with 협력해요 is not impossible in real conversation, but it usually sounds less consistent.

담당자 means the person in charge, the person responsible, or sometimes the 담당 staff/member depending on context.

It is made from:

• 담당 = charge, responsibility, assignment
• 자 = person

So it is not necessarily a manager in the strict English sense. It is often just the person handling that task, department, case, or event.

와 means with here.

• 담당자와 = with the person in charge

It connects the noun 담당자 to the verb 협력해요, because 협력하다 means to cooperate/collaborate, and you cooperate with someone.

A very literal breakdown is:

• 담당자와 = with the person in charge
• 협력해요 = cooperate

So together: cooperate with the person in charge

All of these can mean with, but they differ in style.

• 와/과 = more neutral or slightly more formal/written
• 하고 = common in speech, conversational
• (이)랑 = very casual speech

Also, 와 and 과 depend on the final sound of the noun:

• after a vowel: 와
• after a consonant: 과

Since 담당자 ends in a vowel sound, it becomes 담당자와.

Examples:

• 담당자와 협력해요.
• 담당자하고 협력해요.
• 담당자랑 협력해요. ← more casual

행사장에서 means at the event venue or at the event site/location.

It is:

• 행사장 = event venue, event hall, event site
• 에서 = at/in (location where an action happens)

Korean often uses 에서 for the place where an action takes place.

So:

• 학교에서 공부해요. = I study at school.
• 행사장에서 협력해요. = I cooperate at the event venue.

Here, 에서 does not just mean location in a static sense. It marks the place where the action happens.

These are similar but not the same.

• 행사장 = the physical venue/place
• 행사 = the event itself

So:

• 행사장에서 = at the event venue
• 행사에서 = at the event / during the event

If the intended meaning is specifically the physical location, 행사장에서 is right.

If the meaning is more like during the event or in the event context, 행사에서 could also be possible in some situations.

So the difference is:

• 행사장에서 협력해요. → cooperation happens at the venue
• 행사에서 협력해요. → cooperation happens in the event itself / during the event

협력해요 comes from the dictionary form 협력하다, which means to cooperate or to collaborate.

Breakdown:

• 협력하다 = to cooperate
• 협력해요 = polite present tense

This happens because many Korean verbs ending in 하다 change like this:

• 공부하다 → 공부해요
• 일하다 → 일해요
• 협력하다 → 협력해요

So 협력해요 is just the regular polite -아요/어요 form of 협력하다.

Because 협력하다 usually does not take a direct object the way many English verbs do.

In English, learners may expect something like I cooperate the event, but that is not natural in either English or Korean. You usually:

• cooperate with someone
• cooperate at/in a place
• cooperate on something if needed

In Korean, that often looks like:

• 담당자와 협력해요. = cooperate with the person in charge
• 프로젝트에 협력해요. = cooperate on/in the project
• 행사장에서 협력해요. = cooperate at the event venue

So this sentence is complete without a direct object.

No, Korean word order is fairly flexible as long as the particles stay correct.

These are all possible:

• 저는 담당자와 행사장에서 협력해요.
• 저는 행사장에서 담당자와 협력해요.
• 행사장에서 저는 담당자와 협력해요.

The basic meaning stays very similar because the particles show the roles:

• 는 = topic
• 와 = with
• 에서 = at

That said, word order can slightly change emphasis. Putting 행사장에서 earlier may emphasize the location more.

협력해요 is in the polite informal style, often called the -요 form.

It is very common in everyday polite conversation.

Here are some related forms:

• 협력합니다 = more formal, often used in presentations, announcements, business situations
• 협력해요 = polite and natural for everyday speech
• 협력해 = casual, used with friends or people younger than you

So the full sentence can change like this:

• 저는 담당자와 행사장에서 협력합니다. → formal
• 저는 담당자와 행사장에서 협력해요. → polite everyday
• 나는 담당자와 행사장에서 협력해. → casual

Yes, very often.

Korean frequently drops subjects when they are clear from context. So in conversation, you might simply say:

• 담당자와 행사장에서 협력해요.

This can still mean I cooperate with the person in charge at the event venue, if the listener already knows you are talking about yourself.

Korean leaves out information more often than English when it is understood from context.

Yes, it is grammatically natural.

It clearly means that the speaker works together with the person in charge at the event venue. Depending on context, a Korean speaker might also say something slightly different for nuance, such as:

• 저는 행사장에서 담당자와 협력해요.
• 저는 행사장에서 담당자와 협업해요.

But your original sentence is perfectly fine. The main thing to notice is how Korean builds meaning through particles:

• 저는 = topic
• 담당자와 = with the person in charge
• 행사장에서 = at the event venue
• 협력해요 = cooperate

That structure is very typical of Korean.