Since sunday is the last day of Nostalrius and most guilds raid on Sunday, i think we could organize a HUGE where every single guilds meets somewhere (i though of silithus).
This could get epic dimensions. If there is willingness i thought that every guild could chose a different place as their starting point and every guild marched at the pre-arranged meeting spot. I am up to any ideas, but i think a farewell event must be made!