Three-Logo Event Brand Design

I’m planning an upcoming event that brings together three partner organizations. Each has an established logo, and I need a single modern emblem that visually unites them without losing their individual character.

Here’s what I’m after:
• Overall look: clean, current, unmistakably modern.
• Palette: largely neutral tones—think sophisticated greys, muted metallics, or other subtle hues that read well in print and on-screen. Accent colors are welcome if they help the mark pop.
• Use of existing assets: I’ll supply high-resolution versions of the three logos. I’m open to any creative approach—whether you keep key elements distinct, blend them, or reinvent them entirely—so long as the final design feels cohesive and balanced.

Deliverables:
1. Primary logo in vector format (AI/SVG) plus PNG and JPG exports.
2. A monochrome variant for dark and light backgrounds.
3. Basic usage guidelines (font names, color hex/RGB values).

Please share a few samples from your portfolio that show strong logo or brand mark work, especially where you’ve merged multiple visuals or brands. I’m aiming to move quickly once I find the right designer, so let me know your estimated turnaround and how many rounds of revision you include.