Mayor Walter E. Washington acted last week on the following legislation previously approved by the City Council:

The mayor approved a bill that prohibits persons attending events at RFK Stadium from bringing in liquids in bottles, cans or other disposable containers. The legislation also prohibitsunauthorized persons from going onto the playing field at the stadium before, during or after games. Violations of the law are punishable with fines of up to $300.

The mayor approved legislation requiring various city documents - including certain applications, brochures and health and safety materials, to be printed in Spanish as well as English and made readily available for persons whose primary language is Spanish. The Office of Latino Affairs will help to designate, within 50 days after the law goes into effect, which materials should be translated. The program may spend up to $50,000 a year.

The mayor approved a comprehensive legislative package regulating the sale and prescription of hearing aids. Among other things, the bill stipulates that all persons selling and filling hearing aides will have to be registered within six months of the bill's effective date. Persons who prescribe hearing aids may not be in the business of selling them as well.

In addition, the legislation stipulates that home sales visits cannot be made without written consent and hearing aid dealers must give detailed receipts.

The mayor allowed to become law without his signature an emergency bill that places a 90-day moratorium on evictions from property acquired for urban renewal by the city's Redevelopment Land Agency. The mayor opposed the legislation on grounds that it would give preferential treatment to persons living in RLA-owned properties and could delay development in the city, including the planned construction of new low-and moderate-income housing.

The mayor approved emergency legislation continuing city subsidy of 10-cent Metro rides for public and parochial school students 18 and under until Aug 31 for subway fares and until Oct. 31 for bus fares.

The mayor also acted on the following continuing emergency legislation to keep in effect bills previously passed on an emergency basis (pending approval of permanent legislation) which were soon to expire:

The mayor allowed to become law without signing a second emergency bill permitting Advisory Neighborhood Commissions to choose temporary replacements to fill vacated ANC seats until the next regularly scheduled ANC election.

The mayor signed legislation altering the payment dates for insurance premiums and fee taxes. The law establishes quarterly payments instead of annual ones.

The mayor signed continuing emergency legislation setting motorcycle license fees at $21 instead of $12 and setting the price of a dealer's first tags at $53 instead and $19 for each additional tag.

Emergency acts become law immediately upon the mayor's signature and remain in effect for 90 days. All other legislation must lay over in Congress for a total of 30 days during which both Houses are in session. That period usually lasts about two calendar months.

It was reported incorrectly in last week's District Weekly that emergency amendments to the handgun registration law, which were approved by the mayor, would permit private security firms that had not registered their weapons by the previously imposed Feb. 22 deadline additional registration time.

Under no circumstances does the revised law allow for registrationof handguns that were not registered properly before Feb. 22, 1976.