-- Database schema
| party : Party_ID [ INT ] primary_key , Party_Theme [ TEXT ] , Location [ TEXT ] , First_year [ TEXT ] , Last_year [ TEXT ] , Number_of_hosts [ INT ] | host : Host_ID [ INT ] primary_key , Name [ TEXT ] , Nationality [ TEXT ] , Age [ TEXT ] | party_host : Party_ID [ INT ] primary_key party_host.Party_ID = party.Party_ID , Host_ID [ INT ] party_host.Host_ID = host.Host_ID , Is_Main_in_Charge [ bool ] |
-- -- Show the host names for parties with number of hosts greater than 20.

SELECT T2.Name FROM party_host AS T1 JOIN HOST AS T2 ON T1.Host_ID  =  T2.Host_ID JOIN party AS T3 ON T1.Party_ID  =  T3.Party_ID WHERE T3.Number_of_hosts  >  20;