The upcoming Labor Day weekend will be a busy one at Cabin John Village, with the arrival of Le Pain Quotidien and possibly Shake Shack as well. Tables and chairs already have been set up outside Le Pain, which is scheduled to open for business on Monday, Sept. 3. Construction is almost complete at the neighboring Shake Shack, which will make its debut the same day if all goes smoothly. The two restaurants will join Cava, which opened earlier this month, and the upcoming Sisters Thai, which is expected to arrive this fall.