TASK DEFINITION: Classify the relation of question with context to one of these categories: 1) award received, 2) based on, collection, 3) conflict, 4) constellation, 5) convicted of, 6) date of death, 7) director, 8) drafted by, 9) educated at, 10) medical condition, 11) military branch, 12) narrative location, 13) occupation, 14) original network, 15) parent company, 16) point in time, 17) production company, 18) residence, 19) series, 20) service entry, 21) sex or gender, 22) spouse, 23) standards body question.
PROBLEM: Context : Elections to the European Parliament were held in Belgium on June 10, 1979. 
Question : What was the date of Elections to the European Parliament?

SOLUTION: point in time

PROBLEM: Context : A Rum Collins is a cocktail based on the Tom Collins substituting a light rum for the gin. 
Question : Which is the basis of Rum Collins?

SOLUTION: based on

PROBLEM: Context : The 21st Venice International Film Festival was held from 24 August to 7 September 1960. 
Question : When did 21st Venice International Film Festival occur?

SOLUTION:
point in time