Encouraging a guest to be independent
Please go around and introduce yourself to everyone. Could you just introduce yourself to the other guests? Just go in and meet everyone.
I hope you don’t mind introducing yourself around. Don’t stand on ceremony.
Make yourself known.
Get yourself a drink and something to eat.
Just pour yourself a drink (informal)
Just help yourself (informal)
Please feel free to mingle with the other guests.
I hope you don’t mind getting yourself a drink.
The bar’s over there. Please help yourself.