Summer Event lazy but effective idea
Re-use the gen and hook cosmetics from last year, run 1-2 weeks double bp and voilà.
Nothing else. Just the gen and hook cosmetics cuz they look cool and give us a great feeling and double bp cuz it's an event.
Should be very easy to implement, basically just copy paste.
And trust me, I would be very happy to get this. Especially when the other option is just to get nothing this summer.