Instant meetings with calendar free scheduling

Computer software, provided in a non-transitory computer-readable medium, that arranges a meeting between participants, the software comprising:

• executable code that announces a possible meeting at possible meeting times and at possible meeting venues without knowledge of availability of at least some of a set of possible meeting participants;
• executable code that receives from at least some of the set of possible participants preferences for at least one of:
• proposed meeting times and proposed meeting venues;
• executable code that selects a subset of meeting participants to meet at at least one particular location at at least one particular time at at least one particular venue according to preferences and availability of at least some of the set of possible meeting participants, wherein the subset of meeting participants is less than the set of possible meeting participants and wherein the subset of meeting participants is chosen based on the particular meeting venues and times;
• and
• executable code that sends an invitation to the subset of meeting participants.