A match campaign is a named, purpose-built set of matches you can schedule. Instead of one general round of matchmaking, you can run a campaign for a specific networking moment — an "Investor Mixer," a "Mentor Hour," a "Founder Meetup" — and have its matches generated and delivered right when that moment begins.
Find it at Link → Match Campaigns. Your always-on general matches (from the Match Dashboard) keep working independently; campaigns sit alongside them.