An invitation with clear edges
A simple beginning and ending can make a small visit easier to arrange.
Say what you have in mind
Suggest a cup of tea, a short lunch or a walk followed by a visit. Give a time window if you have another commitment later. Clear details help the other person decide without guessing whether the invitation means an hour or a whole evening.
Leave room for an answer
Offer a straightforward alternative if the first time does not suit. Once you agree, avoid adding a long list of plans unless both of you want them. A modest invitation that happens is often more enjoyable than an elaborate gathering that is repeatedly postponed.