personally i'd stay away from joints as they take too long to smoke and are blatantly obvious. this is of course situational.
my advice about a bud bomb was because it has a screw on cap with a small hole in the centre to go on top of the bowl. this means you can keep it loaded (ie dont have to pack it in public, gettin your stash out and so on) so it can hang round your neck ready to burn, and also it can be smoked with the bowl pointing down (ie you dont have to position the lighter and bowl in the obvious "im smoking a pipe" position.) more convenient.
my advice here is the safest i can think of, as you clearly expressed concern, and therefore will appear suspicious if your worried about it.
personally a "rave" means a free party or private event which has no corporate sponsorship or control - the likes of which i have performed at throughout my career from london squat, to rotterdam warehouse, to japanese desert island - and in such cases there has been so much blatant unadulterated substance usage that a joint seems extremely well behaved.
judge the situation using your own wits, but just be extra cautious if your unsure, its better to be safe than arrested.