Learn Croatian: Porazgovarali smo na domjenku. - We chatted briefly at the reception.

The prefix po- gives the verb an attenuative meaning, which simply means it scales down the action. While razgovarati means to talk or converse, porazgovarati means to have a little chat or to talk briefly.

Does adding po- change the verbal aspect of this verb?

Yes. The base verb razgovarati is imperfective, focusing on the ongoing process of talking. By adding po-, you create porazgovarati, which is perfective. It packages the brief chat into a single, completed event.

Why do we use the preposition na for "at the reception" instead of u?

In Croatian, social events, gatherings, and open spaces typically take the preposition na with the locative case to indicate location. Because a reception (domjenak) is an event, you say na domjenku rather than u domjenku.

What happened to the 'a' from the dictionary form domjenak when it became domjenku?

This is a classic example of the fleeting 'a' (nepostojano 'a'). When adding the locative ending -u to the base noun domjenak, the final a drops out. It only exists in the nominative case to make the cluster of consonants easier to pronounce.