Venues could be a great addition to BH, if connected to Schedule, Contacts and even Stage Plots.
Particularly useful for those who use stand-in musicians but really for everyone, it would contain address, zip/post code, contact, usual performing and break times, special loading or performance wishes, noise meter warnings, parking instructions, lighting needs and maybe more. It would be great for one-off or repeat gigs.
All these things, connected from the Schedule, with Setlist (good to keep the actual list of songs used in a history file as well, optionally) it would complete the gigging landscape beautifully, with all the information you would want.