U.S. tech companies are stepping up office perks, hoping to make employees feel happier about returning.

When Google employees returned to their mostly empty offices this month, they were told to relax. Office time should be “not only productive but also fun.” Explore the place a little. Don’t book back-to-back meetings.

Also, don’t forget to attend the private show by Lizzo, one of the hottest pop stars in the country. If that’s not enough, the company is also planning “pop-up events” that will feature “every Googler’s favorite duo: food and swag.”

But Google employees in Boulder, Colo., were still reminded of what they were giving up when the company gave them mouse pads with the image of a sad-eyed cat. Underneath the pet was a plea: “You’re not going to RTO, right?”

R.T.O., for return to office, is an abbreviation born of the pandemic. It is a recognition of how Covid-19 forced many companies to abandon office buildings and empty cubicles. The pandemic proved that being in the office does not necessarily equal greater productivity, and some firms continued to thrive without meeting in person.