Sep 14–16, 2026 650+ B2B Attendees
Illinois Association of Highway Commissioners Annual Seminar 2026
Public Works & Infrastructure • Thelma Keller Convention Center (Effingham, IL)
7.6 / 10 Moderate Corridor Compression
Verified Thelma Keller Convention Center Trade Show & Convention Schedule
Upcoming Flagship Events at Thelma Keller Convention Center (1 Major Shows Mapped)
Full Annual Convention & Trade Show Directory (1 Verified Shows)
Annual & Rotating Conventions Hosted at Thelma Keller Convention Center
| Convention / Trade Show | Typical Cycle / Dates | Attendance | Halls & Campus Footprint | 10×10 Booth Benchmark | Dossier / Quotes |
|---|---|---|---|---|---|
| Illinois Association of Highway Commissioners Annual Seminar Construction & Trades Trade Association & Conference Committee • Construction & Trades | 2026-09-14 – 2026-09-16 | 650+ B2B Attendees | Thelma Keller Convention Center Grand Ballroom & General Session Plenary (12,000 sq. ft.) | $39–$47/sf (~$9,150 10×10 Est.) |
Promoter Site-Selection & Hotel Rate Leverage
12-Month Thelma Keller Convention Center Compression & Need-Date Matrix
Peak Months: March–May & September–November • Best Value Window: June–August & Mid-December–January
JAN Peak
Q1 Flagship Trade Show Surge
FEB Peak
High Association & Expo Demand
MAR Peak
Peak Spring Convention Window
APR Moderate
Shoulder Openings Late April
MAY Moderate
Strong Late-May Negotiation Leverage
JUN Value
Summer Value Rates Begin
JUL Value
Maximum Room-Block & Space Concessions
AUG Value
High Availability & Value Pricing
SEP Moderate
Fall Season Kickoff
OCT Peak
Peak Q4 Enterprise Congresses
NOV Moderate
Early Nov Busy; Late Nov Value
DEC Value
Mid-December Corporate Value Window
Live Dossier-Grounded Logistics & Rate Concierge
Grounded on Verified Facility Tariffs, Union Rules & Walk RingsAsk Anything About Thelma Keller Convention Center Specs, Union Rules, Hotels or Buyouts
Ask specific operational questions — hand-carry monitor limits, electrical & drayage rates, closest walkable hotels, or 30-person VIP dining buyouts.
Frequently Asked Questions (3)
Dates, credential pickup, exhibiting costs, labor rules, walkable hotels, and client dining.
Effingham Union Labor Jurisdiction. Exhibitors may hand-carry small pop-up materials in a single trip without dollies; crated dock freight, forklift drayage, overhead rigging, and electrical distribution route through official facility and show contractors. Thelma Keller Convention Center Exhibitor Carry-In Policy (Union Jurisdiction): One exhibitor badge-holder may hand-carry personal display materials or a single rolling luggage case in one trip through main public/hotel entrances without drayage charges; two-wheel dollies, pushcarts, and crated dock deliveries route through official material-handling labor.
Thelma Keller Convention Center Exhibitor & Operations Guidelines
Thelma Keller Convention Center offers 2,500+ convention corridor rooms within a 10-minute walk/skybridge plus 0 vetted corridor steakhouses and full-venue buyouts. Federal FY 2027 GSA Per-Diem for Effingham is $215/night lodging and $79/day M&IE.
Conventions.com Venue Corridor Audit
Connected Convention & Corridor Graph (Effingham, IL)
Compare Nearby Effingham Convention Venues, Upcoming Trade Shows & Booth Cost Tools
Other Effingham Convention & Buyout Venues
All Venues →- Centro de convenciones Siglo XXI247,000 sq. ft. • Union Jurisdiction
- Centro de Convenciones Tlatelolco48,437 sq. ft. • Union Jurisdiction
- Centro de Convenciones Vidanta50,000 sq. ft. • Union Jurisdiction
- Centro de Convenciones Villa de Pozos25,000 sq. ft. • Union Jurisdiction
- Centro de Convenciones y Espectáculos45,000 sq. ft. • Union Jurisdiction
- Centro de Convenciones y Exposiciones43,000 sq. ft. • Union Jurisdiction
Upcoming Effingham Conventions
Full Calendar →- World of Concrete 2027Tue Jan 19 – Thu Jan 21, 2027 • 60,000+ Fleet Buyers
- World Strategic Forum 2026Oct 19–20, 2026 • 1,200+ B2B Attendees
- World's Largest Rattlesnake Roundup 2026Mar 13–15, 2026 • 25,000+ B2B Attendees
- Western Pension & Benefits Council Spring Conference 2026May 17–19, 2026 • 550+ B2B Attendees
- Western Pension & Benefits Council Spring Conference 2027May 12–14, 2027 • 550+ B2B Attendees
Exhibitor & Promoter Cost Calculators
All Tools → Orlando OCCC Trade Show Booth Cost & Right-to-Work Drayage Calculator
$148/CWT Drayage • $118/hr Labor
18-City Trade Show Group Hotel Block, Resort Fee & GSA Per-Diem Calculator
Compare 10–250+ room blocks & GSA caps
New York Javits Center Booth Cost, Union Labor & Drayage Calculator
$224/CWT Drayage • $176/hr Labor