- B Week Recycling Collection Location: Mandan residential areas. Date: April 6, 2026 (all-day). Time: All day. Cost: Free (city service). [4] - National Public Health Week Location: Mandan community-wide. Date: April 6–12, 2026 (all-day). Time: All day (multi-day observance). Cost: Free. [4] - Sweet Dreams – Safe Sleep for Baby Location: Not specified (Mandan community event). Date: April 6, 2026 (all-day). Time: All day. Cost: Not mentioned (likely free). [4] No festivals, fairs, or large publ