There are many many ways dancers may assist other dancers, new folks and regulars, to enjoy the dance experience and help develop a friendly and welcoming dance community.
Classically one may ask new arrivals to dance, especially early in the dance program. Simply being friendly probably will be more easily accepted than to appear to be bombarding them with data they aren't taking in. Here are a few very well worded notes on this subject from dancers, callers and dancer leaders.
Crowded Halls, by Brad Foster (pdf 42.3 KB) [hosted by CDSS]
Intergenerationality in the Dance Community, age ranges, shared fun, by Lily Leahy (pdf 188.5) [hosted by CDSS]
Not too surprisingly we dance using many formations or arrangements of people moving in circles, squares, lines, triangles, U shaped formations even
When we have a discrete or required number of dancers or couples some will call that a Whole Set formation. These are often danced once-and-to-the-bottom, a fairly straightforward progression
Some may call these Set dances, and in some traditions or forms of dance that may well be accepted, however unless it is a big, loose circle of dancers, with no partner, many (not all) dances are said to be in a set, a set of dancers
Why say all this? It's a fluid enough thing, there are enough styles; nothing is correct, unless a context is set for it stating that is the case. Since it's really all about the joy of company, movement and music, use what works, attempt to understand others, dance
(or simply "it works best with x