Yesterday I wasn't sure what to do with all my stats about who played what weekends when over the last few years, but here's a question we can answer now: how long do weekends wait before bringing someone back? I looked through all the repeat bookings [1] and counted how many years there were in between. So, two psuedo histograms, one for bands and one for callers:

Bands

0
1  I
2  IIII
3  III
4  III
5  III
6  II
7  I
8  I
9  III
10 II
11
12
13
14
15 I
16
17
18 I

Callers

0  IIIIIIII
1  IIIIIIIIII
2  IIIIIIIIII
3  IIIII
4  IIIII
5  IIIIII
6  IIII
7  III
8  III
9  I
10
11
12
13 II
14 I
15
16
17
18
19
20
21
22 I

Apparently caller and band re-booking are really different! Callers are much more likely to be asked back, and much much more likely to be asked back for the following year.

[1] I didn't include the Oberlin student band bookings because those seemed like a different sort of phenomenon.