<Tr> <Td> 1976 (1) </Td> <Td> Conference Semifinals </Td> <Td> April 29, 1976 </Td> <Td> Coliseum at Richfield </Td> <Td> Cleveland Cavaliers (1) </Td> <Td> 87--85 </Td> <Td> Washington Bullets (6) </Td> <Td> </Td> </Tr> <Tr> <Td> 1976 (2) </Td> <Td> Conference Finals </Td> <Td> May 16, 1976 </Td> <Td> Oakland--Alameda County Coliseum Arena </Td> <Td> Phoenix Suns (2) </Td> <Td> 94--86 * </Td> <Td> Golden State Warriors (5) </Td> <Td> </Td> </Tr> <Tr> <Td> 1977 (1) </Td> <Td> Conference Semifinals </Td> <Td> May 1, 1977 </Td> <Td> The Spectrum </Td> <Td> Philadelphia 76ers (7) </Td> <Td> 83--77 </Td> <Td> Boston Celtics (13) </Td> <Td> </Td> </Tr> <Tr> <Td> 1977 (2) </Td> <Td> Conference Semifinals </Td> <Td> May 4, 1977 </Td> <Td> The Forum </Td> <Td> Los Angeles Lakers (14) </Td> <Td> 97--84 </Td> <Td> Golden State Warriors (6) </Td> <Td> </Td> </Tr>

When was the last time both conferences went to game 7