Not quite a mandatory advertising channel, but, as our experience shows, if your establishment is already popular and has good traffic, then the site will solve three problems. The first and most important is booking tables, for example, as we did here: kuznya-bar.rf/reservation/ . The second task in order of importance is to look at prices, promotions, menu. The third is to simply find out the opening hours, phone number and call. Although, to be honest, the second and third tasks can be easily implemented through social networks.
VKontakte + targeted advertising
In order for the group to develop well, it is necessary to focus maximum active telegram number data efforts on high-quality and interesting promotions, contests, bonuses, etc. Group management, contests and mini-events, guest posts and targeted advertising will even allow you to accept orders from the VKontakte group. Not immediately, of course, but with hard work, in 2-3 months you will begin to receive a positive return on the financial resources invested in this advertising channel. You can also place the establishment's menu in the social group, collect reviews and feedback from visitors through questionnaires, write down the rules of the establishment, work schedule, all the necessary contacts, publish announcements, photo and video reports, advertise additional services in terms of organizing, holding banquets and other events. Again, I would like to say the obvious: the result of your marketing activities will only be if your restaurant or cafe is initially competitive in price, quality of food, service, geographic location, interior.

Instagram + targeted advertising
This social network is used by your target audience, young people, glamorous girls and boys, successful, wealthy people. In general, all those who can afford to visit your restaurant or cafe at least once a week. Accordingly, God himself told you to try to create a business account on Instagram, hold contests there and launch targeted advertising.
Promoters
Are you planning a grand party and want to invite as many people as possible? Or have you come up with an offer that is hard to refuse, such as a three-course business lunch for 50 rubles? Hiring promoters for a couple of hours and placing them at the entrance to the business center is, I believe, a good and inexpensive idea that will 100% work and cover the costs of implementing this advertising channel.
Discount system
There is nothing special to write here, there should be discounts in this service sector, these are banal “happy hours”, “discounts on alcohol on Sundays and weekdays”, “when ordering this and that, it’s free” and much, much more.
It seems to me that marketing in this field of activity is 80% based on the concept of discounts and bonuses, so look at what the leaders of your market are doing, adopt successful experience and try to implement it in your practice.