Bohemian Caverns is really bringing out the big guns in its 85th year. This weekend—-the first in April, aka Jazz Appreciation Month—-will bring two more new features. One is permanent; the other’s future is to be determined.

Saturday kicks off a new weekly series of jam sessions beginning at midnight. Longtime Caverns patrons will recall that, for a few years, the club had a Friday late-night jam session featuring the D.C. trio The Young Lions. Those ended in 2009, but owner Omrao Brown has decided to give it another shot on Saturday, when clubgoers are more likely to stay out late. This Saturday features The Jolley Brothers, but the jams will rotate regularly between the Jolleys, the Young Lions, and Will Rast’s organ trio. It’s a welcome addition to a D.C. jam-session culture that’s getting ever deeper.

Sunday offers more of a change of pace for an existing feature. The Sunday Jazz Lounge, the weekly gig by the Joe Herrera/Rodney Richardson quartet that premiered in March at Twins, has been a big success with its stellar band and novel addition of an opening soloist. Unfortunately, Twins was booked every Sunday in April. Thus, guitarist Richardson has announced that the lounge is moving, at least for this week, to the Caverns. (Guest soloist this week TBA.) There’s no indication that this will be a permanent home—-but one way to help ensure that is a big turnout at the 8 and 10 p.m. sets. $5.