Depending on the number of tickets sold, there may be 4-8 tables of 4 chairs each down front. Sold out shows will just be rows of chairs, capacity for the show area is 180.
And on a related note:
I was curious, so here's capacity for some DC and around DC venues:
FedEx Field
80,000
RFK
55,000
Nissan Pavilion
10,000 pavilion
12,500 lawn
--------
22,500
MCI Center
20,600
Merriweather Post Pavilion
5,200 pavilion
14,000 lawn
--------
19,200
Patriot Center
10,000
Wolf Trap
3,868 pavilion
3,160 lawn
--------
7,028
Constitution Hall
3,702
9:30 Club
1,200
State Theatre
500 (all seated) or 950
Birchmere
500
Black Cat
325
Rams Head
256
Jammin' Java
180
Iota Club & Cafe
160