Getting info from your guests from internet
A good practice I recommend when using Bdc is to always have a look in internet of your coming guests. You will easily find something about them at Facebook or social networks, even with a quick google search. It helps me felling more confortable by knowing how is coming to my house and always gives you ideas of what kind of guest you will have and of course it helps giving them tips about the city or preparing something special just for them. Last time as a gift, I prepare some glucose gels as they were participating in the md-marathon... they really appreciate it..
Social medias are very useful for seeking information about our guests. I do a little search myself also. I even search their home address in google maps. There is always some information you can find in searching and it is very useful in knowing your guests before they come.