Page Wilson, on his “Out O’ the Blue Radio Revue” tomorrow night from 8 to 10 on WCVE (88.9 FM), will re-air two segments of a solo concert by John Cephas, the legendary Piedmont bluesman who died March 4. The JAMinc concert was recorded May 1, 2008, at Richmond’s In Your Ear Studios. Also, a memorial service and musical tribute to Cephas will take place from 1 to 3 p.m. Sunday at the Smithsonian National Museum of Natural History’s Baird Auditorium in Washington. A House Party Jam will follow at Westminster Presbyterian Church, 400 I Street S.W.