More changes in store at Westfield Montgomery Mall, where some of the last remaining independent retailers will be among those exiting before summer. Shafa Blends, which opened three years ago under the name Rumi Tea and Spice, has relocated to Gaithersburg. Boba Station also is out (see story above), and other longtime tenants like Solstice and Pen Boutique are getting ready to leave. Hoamgar, an Asian chain that was testing the U.S. market, will close its doors this spring. Some of those empty spaces will likely be filled with attention-getting pop-up shops — like this minivan filled with Italian shoes.