I have registered for a conference, but there is additional registration fee for a conference dinner. Since I am from developing country and I haven't got a refund source, I find it expensive. Can I go to the restaurant and order something cheaper for myself?
You’d have to check with the conference organizers. However, usually when such dinners are organized, the conference has already contracted a reduced price per attendee in exchange for a volume order with a fairly limited menu selected in advance. You usually don’t get to order à la carte off the restaurant’s menu.