I'll pick you up around 8.00, if that suits you?

Notes:

• You are going out for the evening with a friend...
• To pick someone up. This is a phrasal verb. It means to drive in your car, collect the person, and take them somewhere.
• I'll pick you up means: I will drive to your house, collect you and then we will drive somewhere together.
• Around 8.00. You don't have to say 8 o'clock. It's obvious you're talking about the time. Around 8.00 means more or less 8 o'clock.
• If that suits you? If that's OK with you / if that idea fits in with your plans.
• This sentence is either formal or informal.