LSE Summer Schools: Worth It?

Hello, 

I am 22 years old currently doing an off-cycle internship at a bulge bracket in Paris (corporate banking/corporate financing). I am enrolled in a Master in Finance in a semi-target uni in Paris (those that have many of their students going to London in IB but still not LBS/LSE/Oxford) I was wondering what to do this summer as the summer internships in the banks that interest me are already gone: Do you think that a "Summer School" of 2-3 weeks in a target school (saw that LSE has many, but will do some research) could be a great experience, and add something to my CV? They are very expensive so I have to get some feedback on them. Any help would be very appreciated!