Yes. Tourists can be admitted to large-scale events if they can show a COVID certificate.

The following applies to people who have been vaccinated:

You can request a Swiss COVID certificate if you are visiting and if you have been fully vaccinated with a vaccine that is authorized in Switzerland.
Visit the National COVID Certificate application platform to request a COVID-19 Certificate. 

The following applies to people who have not been vaccinated:

You must have a test, and if the result is negative you can then be issued with a COVID certificate.

Source: https://www.bag.admin.ch/bag/en/home/krankheiten/ausbrueche-epidemien-pandemien/aktuelle-ausbrueche-epidemien/novel-cov/haeufig-gestellte-fragen.html?faq-url=/covid/en/covid-certificate/are-tourists-also-admitted-large-scale-events-where-covid-certificate-required