Well,it is a bad idea to invite your employees to your house anyways - renting space at park is very cheap and a much better idea. First you have to worry about employees stealing stuff or scoping out the house for robbery, etc. Secondly I'd be worried about liability. If someone got hurt during one of these BBQs the homeowners insurance might not want to pay out because they could make an argument you were engaging in business activities during the incident and lots of home owners insurance don't cover business activities. Thirdly, your employees might not be all that comfortable going to your house, going to someone's house, feels a lot more "intimate" than meeting in a public place, and many people aren't comfortable with going to a party at the big boss's house.