informal, hourlong, unscheduled, unrehearsed, spontaneous, makeshift, unannounced, daylong, awkward, raucous, impassioned, ad hoc, extemporaneous, interpretive dance, celebratory, extempore, mock, spirited, occasional, brief, uproarious, boisterous, hour, exuberant, unplanned, interminable, videotaped, pep talk, unofficial, calisthenic, riotous, uneventful, unexpected, boozy, unsanctioned, rousing, obligatory, electrifying, acrobatic, robing room, rowdy, photo op, tearful, perfunctory, unamused, interpretative dance, lighthearted, routine, unusual, weeklong, lively, imaginary, unanimated, pep rally, desultory, odd, quickie, ad lib, bizarre, elaborate, mini, teary, jocular, offbeat, comical, unruly, unorthodox, ersatz, unposed, offhand, improvisational, serendipitous, abbreviated, exultant, backstage, testy, bongo drum, innocuous, amiable, ebullient, frenzied, undignified, monthlong, unforgettable, ex tempore, unscripted, drunken, overenthusiastic, prearranged, giggly, ceremonious, stilted, whistlestop, allnight, infamous, embarrassing, mirthful, inebriated, coffee klatsch, convivial, intimate, apple dumpling, similes, sonata, stanzas, concertos, improvisations, scherzo, simile, antitheses, epigram, lyrics, madrigals, particular, romances, witticisms, chansons, elegies, elizabethan, epitaphs, lyric, masques, inaugural, televised, twohour, gala, invitational, extemporary, commencement, cuff, latenight, nightly, toface, nonstop, upcoming

ad hoc, jam session, uncontrived, unstudied

address, musical passage, passage, speech

ad lib, ad libitum, spontaneously, spur-of-the-moment, unprepared