Board Thread:Special Events/@comment-1820055-20140815075833/@comment-24332640-20140823083756

You can switch CVLs for CVs but you then run the risk of going to the night node F. A 3 CV fleet still guarantees the sub node, which is good, but going to the night node with only three ships that actually fight at night is not a good idea unless you have a sub in your fleet. Those destroyers have a high cut-in rate so your best bet is to kill them first, but that just isn't going to happen with only 3 night-fighting ships. A sub would attract all the destroyers' attention and prevent cut-ins, but at the cost of significantly lowering your fleet's firepower as well as running a reasonably high risk of getting stomped by the destroyers at the first node.

But still, it's a 50/50 chance whether you go there or to H after the sub node, so it's not like it isn't doable. Just hope you go to H...