'Let's meet at 万达' is shorthand for meeting up in any given Chinese city — there is almost certainly a Wanda Plaza within reach. Compare with 'meet at the mall' in Anglophone suburbs.
The mall format of Wang Jianlin's Dalian Wanda Group. Over 400 Wanda Plazas across China — each typically bundles a department store, cinema, karaoke, and food court. Ubiquitous in second- and third-tier city centres.