Logo designs for 4 events

I need to create logo concepts for 4 events, all 4 events are connected so the style of the logos will need to be the same. Each design will need an icon created.

Event names are the following:
Resource & Waste Management Expo - Please make this red in colour
Energy & Alternative Fuels Expo - Please make this yellow in colour
Contamination & Land Remediation Expo - Please make this green in colour
Water & Wastewater Solutions Expo – Please make this blue in colour

I need these ideas turned around in 24 hours.

Please send me your best logo designs, ideally you will have branding experience too.
Also what you will charge.

Thanks

Jason