Pasa por mi casa después de la reunión.

Yes. In this sentence, pasa is most naturally the informal singular command (the tú imperative) of pasar.

So Pasa por mi casa... means something like:

• Drop by my house...
• Come by my place...

Spanish often leaves out the subject pronoun, so you do not need tú here.

A few related forms:

• Pasa por mi casa = informal, said to one person you address as tú
• Pase por mi casa = formal (usted)
• Pasad por mi casa = plural in Spain (vosotros)

In context, pasa could also be present tense (he/she passes), but in this kind of sentence it is normally understood as a command/invitation.

Because Spanish usually does not include the subject pronoun unless it is needed for emphasis, contrast, or clarity.

So instead of saying:

• Tú pasa por mi casa...

Spanish normally just says:

• Pasa por mi casa...

This is especially common with commands. Adding tú would usually sound emphatic, and often unnecessary.

Because the expression here is pasar por + place, which means to stop by, to come by, or to drop by a place.

So:

• pasar por mi casa = come by my house / drop by my place

If you used a, you would normally need a different verb:

• Ven a mi casa = Come to my house
• Ve a mi casa = Go to my house

So the preposition changes with the verb pattern:

• pasar por
• venir a
• ir a

It can mean either, depending on context.

In everyday Spanish, casa often works like home or place in English, not just the physical building. So here mi casa is very naturally understood as:

• my house
• my home
• my place

In casual English, Come by my place after the meeting is often a very good match.

Literally, yes, it is related to pass by my house, but in normal usage it usually means drop by or stop by.

So the idea is not just physically moving past the house. It usually implies:

• come for a short visit
• stop there on your way
• visit briefly

That is why Pasa por mi casa después de la reunión sounds like an invitation.

Because when después is followed by a noun or an infinitive, it normally takes de.

So:

• después de la reunión = after the meeting
• después de comer = after eating

But if nothing follows it, you can use después alone:

• Nos vemos después = See you later / See you afterwards

So in your sentence, de is required because después is followed by la reunión.

Because Spanish often uses the definite article when referring to a specific, known event.

So:

• después de la reunión = after the meeting
  (a specific meeting both speakers know about)

If it were not specific, you might say:

• después de una reunión = after a meeting

In this sentence, la reunión suggests a particular meeting already understood in context.

Because the correct spelling is después.

The accent mark shows the stressed syllable: des-PUÉS.

Spanish accent marks are part of the spelling, so you should always write it with the accent.

Because the correct word is reunión, with the stress on the last syllable: reu-nión.

The accent mark helps show the correct pronunciation and stress pattern. As with después, this is not optional spelling.

Yes, it is completely natural and understandable.

That said, in Spain, people also very commonly say:

• Pásate por mi casa después de la reunión.

This uses pasarse por, which is very common for drop by / stop by.

So both are natural, but:

• Pasa por mi casa... = correct and natural
• Pásate por mi casa... = often even more idiomatic in everyday speech

They are similar, but not identical.

• Pasa por mi casa = drop by my place / come by my house
  • often suggests a brief stop or a stop on the way
• Ven a mi casa = come to my house
  • more neutral and direct

So pasar por has a slightly more casual stop by feeling.

Yes. Spanish word order is flexible.

You can also say:

• Después de la reunión, pasa por mi casa.

This means the same thing. Putting Después de la reunión first can make the time reference slightly more prominent.

Both orders are natural:

• Pasa por mi casa después de la reunión.
• Después de la reunión, pasa por mi casa.

It can definitely sound like an invitation, not just an order.

In Spanish, the imperative is often used for:

• instructions
• invitations
• suggestions
• encouragement

So depending on tone of voice and context, Pasa por mi casa después de la reunión can sound like:

• Come by my place after the meeting
• Do stop by after the meeting

It does not have to sound bossy.

For formal usted, you would say:

• Pase por mi casa después de la reunión.

If you want to sound softer or more politely inviting, you could also use expressions like:

• Pasa por mi casa si quieres. = Come by my place if you want.
• Puedes pasar por mi casa después de la reunión. = You can come by my place after the meeting.
• ¿Por qué no pasas por mi casa después de la reunión? = Why don’t you come by my place after the meeting?

These often sound less direct than a straight imperative.

In Spain, for vosotros, you would say:

• Pasad por mi casa después de la reunión.

A very common everyday version would also be:

• Pasaos por mi casa después de la reunión.

That has the same drop by sense as pásate in the singular.