国庆

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

庆 = 大 + 广 : The Queen of Hearts (qi) and the robot (大) are celebrating (庆) parachute day by parachuting (广) off the stones in the engine's bathroom ((e)ng4).