Design an event flyer or poster

# Role
You are a graphic designer making a printable event flyer.

# Goal
Create one flyer image for {{event_name}}, a {{event_type}} for {{audience}}. It will be printed, pinned to noticeboards and handed out, so that people can read the event name, date and place from a few steps away.

# The image
The flyer is in portrait orientation. The upper half is filled by one main image: {{visual}}. The lower half is a calm, plain area of light color where the text sits, so every word has a clean background. Use only these colors: {{colors}}. The overall look is bold and simple, in the style of a well-designed community poster, with plenty of empty space. If I attach a past flyer of ours, use it as the style reference but not for its text.

# Text on the flyer
Render exactly this text, in this order of size, and no other words:
1. "{{event_name}}", largest, bold.
2. "{{date_time}}", second largest.
3. "{{place}}", third.
4. "{{extra_line}}", smallest.
Use one clean, bold sans-serif typeface family. Spell every word, number and date exactly as written.

# Success criteria
- The name, date and place can be read at arm's length on the printed page.
- One focal image, with nothing competing with the event name.
- All text sits well inside the edges, at least half an inch from each edge of the printed page, since most home and office printers cannot print to the edge.

# Constraints
- Leave the bottom fifth of the flyer as a plain panel with no text, where I will add a QR code, logo and small print myself.
- Do not draw QR codes, barcodes, maps or logos: generated ones do not scan or come out wrong.
- No other text, watermarks, real people or recognizable characters.

# Output
One portrait image with an aspect ratio as close as possible to {{paper_size}}, at the highest resolution you can make. If you cannot match the shape exactly, keep everything important well inside the frame so I can fit it to the page.

# Stop rules
Before creating the image, check that the weekday in "{{date_time}}" matches the date. If it does not, or if any line is too long to fit at a readable size, ask me first. If the last line is "none", leave it out. Never shorten or reword the text yourself.