1.There are always ice lattern show at every Lattern Festivel.
2.On/Upon hearing the news,he jumped up with joy/delight.
3.Jack was dressed up and went watch the ice latterns in the square.
or
Jack was dressed up for watching the ice latterns in the square
or
Jack was dressed up to watch the ice latterns in the square.
dress up:打扮;穿上盛装(本身就指代穿新衣服,后面不再搭配衣服).
祝你开心如意!