A few tables with boards in the coffee area. No registration and no pairing: you sit down, play a game, and go back to the sessions.
A good addition is puzzles on the tables - «mate in two», with the host showing the solution. People get drawn in without even playing a game.
A real tournament once the business programme closes: five to seven rounds of 3+2 or 5+3, an hour and a half to two hours, with prizes from the organizer or a sponsor.
It keeps people on site at exactly the moment they would otherwise disperse, and gives a more natural setting for meeting each other than a drinks reception.
What it needs: a room or a partitioned area, boards for the number of pairs, and somebody running the pairings. A Swiss system is compulsory - a knockout removes half the field immediately: why a Swiss.
The pairings are easiest in the app: guests sign up from a QR code on a poster, each pairing arrives on their phone and the table can go on the room screen.
The strongest option for a company with a stand. An invited strong player - a master or a grandmaster - plays 10 to 20 guests at once.
What it needs: tables in a horseshoe, 10 to 20 sets, an exhibitor and an hour and a half to two hours. The most expensive of the three formats, and the most visible - how to run one.
Adjacent formats - chess team building and offsite events.
Three work: a play area during the breaks (minimal cost, runs all day), a blitz tournament after the business programme (keeps people on site) and a simultaneous exhibition on a stand (the most visible and the most expensive).
Four to six for a break-time area; ten for a tournament of twenty players; for a simul, one per participant, usually 10 to 20.
About two hours: five to seven rounds at 3+2 or 5+3 plus registration and prizes. That fits into the evening after the business programme closes.
It keeps somebody nearby longer than handing out merchandise does, and gives a natural reason to talk. Signing up for a simul works as a voluntary contact form, and the photographs look better than standard stand footage.
Yes, at least one person. Without one the chess area sits idle: somebody has to offer a game, explain the format and start the tournament. A simul additionally needs the invited player.
Pairings are computed by bbpPairings, an open-source engine implementing the Dutch system by FIDE rules: score groups, floats on an odd field, colour alternation. Free to use.
proper rounds with correct pairings, not random matchups
a full circle, with the round count derived from the field
a light format with no tournament machinery
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Adjacent formats - festivals, offsite events. For companies - tournaments at work, team building.