One thing worth knowing, this is a community forum so the n8n team may not answer visa specifics here reliably, best to email their events team directly for anything official. That said, generally: yes, conferences like this are open to international attendees including from Pakistan, there’s no attendee restriction by nationality. On the visa letter, most organisers will provide an invitation letter after you’ve purchased a ticket, but it typically confirms your registration rather than sponsoring you, and it’s issued on request, not automatically. For refunds if your visa is refused, that’s exactly the kind of policy that varies, so get it in writing before buying. Applying early and showing strong ties home helps Schengen apps. Good luck, hope you make it.