They are among a number of blue-chip brands that have already taken part in the survey, which gathers data on the major issues currently facing the industry.
Budgets, CSR, ROI, destination preferences and 2010 plans are among the topics that come under scrutiny.
The results will form the basis of C&IT's 2010 State of the Industry report, a comprehensive analysis of the UK events industry.
The deadline is 15 January. Corporate event planners who have not yet completed the survey can take part here.
Respondents will be entered into a prize draw to win a luxury two-night break for two people at a Barcelo UK hotel of their choice.