Brands do not sponsor events. They buy access to an audience, and they buy proof that the access was delivered. Every weak sponsorship deck fails because it describes the event instead of the audience.
Lead with who is in the room
Age range, location, spending behaviour, what they do for work, what else they attend. If you have run an event before, you have this data in your ticket records. If you have not, say so honestly and price accordingly.
Sell something specific
"Logo on the banner" is worth almost nothing and everybody knows it. Sell the bar. Sell the photo wall. Sell the fifteen minutes before the headline act when everyone is in the room and looking at the stage. Specific placements are easier to value and easier to defend.
Price in tiers, but keep them few
Three tiers is plenty. More than that reads as a negotiation you have already started with yourself.
Approach earlier than feels reasonable
Marketing budgets in Nigeria are typically committed quarterly. Reaching a brand six weeks before your event means you are asking for money that has already been allocated. Three to four months is a real conversation.
Deliver a report afterwards
Attendance, scans, demographics, photographs of their placement, social reach. Sponsors renew on evidence. The organizer who sends a two-page report a week later gets the call next year without pitching.