No one will mind slipping out of street shoes and into some cozy slippers or a comfortable pair of socks.
Give 'em the Slippers
Keep a few pairs of different size slippers (some more unisex than others) on hand to offer your guests.
Sock It to Them
A supply of footies (with skid-resistant soles) or cotton bobby socks (slip-proofed with puffy fabric paint) is a less expensive (and more machine-washable) option than slippers.
No, you may not in good conscience ask the cable repairman to take off his boots, but you can ask him to slip on a pair of these surgical-supply shoe covers.
Shoe covers, $45 to $50 for 150 pairs, uline.com