1. What does it mean?
팬싸 shortens 팬사인회, a fansign event. Fans may get an item signed and exchange a few words with an artist, depending on the event format. It names the event, not a general fan gathering.
Also written or said as 팬사, 팬사인회, paenssa
2. The nuance
Eligibility, purchasing requirements, time limits, and contact rules differ by organizer. Do not assume a ticket or album purchase guarantees entry.
3. Examples
“팬싸 공지를 읽고 신청 조건부터 확인했어.”
I read the fansign announcement and checked the entry requirements first.
“팬싸에서 할 말을 짧게 메모해 뒀어.”
I wrote down a few things to say at the fansign.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.