Sometimes, it doesn't take much to get people thinking about the gospel outside of church on a Sunday morning.
One event, two crosses, a six word gospel, a few thousand people going by, a half an hour spent and you're done.
If the Lord has been pressing on your heart to be a witness for him in public and/or just starting, this is an easy way in: holding a cross at a city event. Be prepared to share the gospel and be encouraged whether you receive from passersby a thumbs up or a finger up. It means they have read the message on the cross and either way, they are thinking about it. Your mission complete. The rest in is the Lord's capable hands.
And as always, He gets all the glory!