When someone opens your event, the cover photo lands before they have read a word. In that first moment it is doing real work: telling them what kind of event this is, how to dress, whether it is chill or a production, whether to be excited. A good cover sets expectations correctly. A bad or missing one leaves people guessing, and people fill gaps with the most cautious assumption.
The image is a promise about the vibe
Treat the cover as shorthand for the feeling of the night. A dim bar interior says relaxed drinks. A sunny park says casual, daytime, bring something to sit on. A neatly set table says this is a proper dinner, dress accordingly. People genuinely read these cues and act on them, so pick an image that matches the night you are actually throwing, not just one that looks nice in isolation.
Specific beats generic
A photo of the actual venue, the actual street, the actual thing you are doing, beats a generic stock image of a party. Specific images feel real and personal, like an invitation from a person. Generic ones feel like an advert. You do not need a professional shot. A quick phone photo of the place, or a still that captures the mood, almost always reads better than a polished but anonymous image.
Low effort is fine, blank is worse
You do not have to agonise over this. A screenshot from a music video that matches the energy, a photo from the last time you did this, a picture of the cake. Anything specific and intentional works. The one option to avoid is leaving it blank by default when you could spend ten seconds picking something. On PopIn a blank cover falls back to a clean gradient, which is perfectly fine, but a chosen image almost always lifts the read of the event.
Match the formality to the crowd
The cover also signals formality, which matters most when your guest list is mixed. A polished image with the venue logo tells a work crowd to dress up. A goofy photo tells your close friends it is a casual one. If the same event is going to old colleagues and old friends, the cover is part of how you set a consistent expectation across very different groups who will all read it the same way.
One image, one job
Do not overthink it into trying to communicate everything. The cover sets the vibe. The title and description carry the detail. The cover's whole job is the first impression, the gut sense of what this is. Pick something that gets that one thing right and let the rest of the page handle the specifics.