Let's gather information about the British Museum we'll be visiting on the trip.
Literal
Trip [on-で] go British Museum [about-について] information [object-を] let's-gather.
かき集める (to scrape together / to gather) is a vivid compound verb: かく (to scratch/scrape) + 集める (to gather). 情報をかき集める means to actively gather information from various sources. よう is the volitional ending.