it isn't one of the major feasts and it does not seem to get too much attention (at least in my parish).
Actually, after 12 Great Feasts, it's probably the biggest one (not counting Lazarus Saturday + Holy Week), as it's preceded by fast.
In Serbia this feast is called Petrovdan (the day of st. Peter) and of course it's important to break the fast (a dinner, dancing). But there is an interesting habit called "lilanje" done during the vigil - people, especially children, take some prepared long sticks, and put at the end of it some pieces of birch-tree or another one and set fire to this ending, and singing some special songs and waving these burning sticks, they wander through the surroundings. Once I've participated in it, but I have no idea, what does symbolize it.
Added: Once I've been for this feast in Egypt and children in church (Coptic) received some gifts, maybe for the end of the fast?