As for last year, the municipality of Venice, for some specific days the entry to the city of Venice will apply an access fee that must be pre-buy on line in the below dedicated website.
Daily visitors MUST pay the access fee (a QR code must be shown to the authorities if requested).
Clients who have an hotel reservation are entitled to an exemption from payment but it is mandatory to register and obtain the appropriate exemption voucher to benefit from the exemption (a QR code must be shown to the authorities if requested)
This is the link to Venice city both to require the exemption and/or pay the daily fee https://cda.ve.it/en/
The website is very simple and of easy navigation so all information needed can be found ithere