Yes. Cats here should be indoor cats. Even in the city there are raccoons, coyotes, alligators, dogs in people's yards, and CARS. I let them out briefly and supervised, sometimes, to catch a lizard if they are watching them out the window. Or as others say, occasionally on a harness to wander the garden, and eat a little grass.
Obviously that's not always possible, there are feral outdoor cats that sometimes show up, the city has a spay/neuter and release program for those.
This happens sometimes. We have wildly successful parties sometimes, and other times it's just a couple of people and way too much food.
I don't complain because I also don't often attend other people's gatherings.
But yes we need to get back into the habit of visiting and entertaining, it's good for people. And it's good of you to offer hospitality even if nobody showed.