To encourage mingling
Host a party
To encourage mingling
put out less chairs than there are people. People can not mingle if they are sitting.
Set the mood
Play background music to liven up the atmosphere
During the party be sure you get a chance to talk to everyone there
Keep the valuables away
Warnings
Divide Labor
Pick a place
Spread the word
Plan more games and activities than you anticipate playing
Enlist help
Choose a theme
To encourage mingling More ...
Test your English Language 
Musical Instruments
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Host a party
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