* Lamont Library will be open from 9 a.m. to 5 p.m. this Saturday.

* Phillips Brooks House needs recording tape for the benefit of blind students at Harvard. Students who will not need their language lab tapes after this summer are asked to leave the reels with Mrs. Gelinaeu, lab secretary, who will give them to PBH.

* The recorded music schedule for Matthews Hall Common Room this Saturday from 3-5 p.m. will be Moussorgsky's A Night on Bare Mountain and Khovanshhina (selections); Borodin's Quartet no. 2 in D major and In the Steppes of Central Asia; Rimsky-Korakov's Russina Easter Overture; Gliere's Red Poppy and Russian Sailors' Dance, Prokofiev's Symphony no. 6, Opus 111; and Pakhmutova's Concerto for trumpet in E flat minor.

Sunday's schedule: Vivaldi's Concerti for oboe and strings in D minor and F; Bach's Trio sonata (no. 7) and Canon perpetuum (no. 8) from The Musical Offering; Mozart's Concerto no. 5 in A. K.219; and Beethoven's Symphony no. 7 in A, opus 92.

* Busch-Reisinger garden concerts next week daily from 1-2 p.m. will be Rameau's Platee; Mozart's Symphony no. 35 ("Haffner"); Schuman's Waldscenen, Respighi's Doric String Quartet and Trittico Botticelliano (last three works related to art); Handel's Water Music; and Brahm's Sextet.

* The Old North Church presents next Wednesday at 8 p.m. a concert by Virginia Clay, organist. August 23: John Fesperman, organist; and August 30: Sandra Stuart Robbins, soprano.

* Mr. and Mrs. P. N. Mathur of Poona, India, will discuss Hindu beliefs and Indian life tonight at 7:30 p.m. at the First Church (Unitarian) in Harvard Square.