I have the following types of sponsorships for a conference I'm organizing: Bronze, Silver, Gold, Platinum and need a package bigger than Platinum.

Hello! i help organize and run several events here in Arizona and attend many more. In my opinion this is a loaded question and the best answer I can think of is that it depends in where you live and the agenda of the event. Here in Arizona there are a quite a few right at the end of summer and many more travel from out of town to the events and more as the weather begins to cool. in general you don't want to compete with other events relating to technology even if they seem to be "non-compete" because you force your potential audience to decide which can reduce your attendance..and you will also lose the opportunity of having that other host attend your event. I hope this helps a bit. Please submit more questions :)

Social Marketing - I know it goes without saying that social marketing will be talked about. But I think its important to stress what exactly they should be doing with it. So many people think social marketing means having a facebook page, a twitter page or pinterest and have no idea how to actually use these services to grow their brand and build a community around their product.

When you say "2 platform app" are you referring to a multi-sided platform? or specifically a 2 sided marketplace? Like Uber that has a driver and a passenger? If this is the case I recommend you reading about multisided platforms — https://www.amazon.com.br/Matchmakers-New-Economics-Multisided-Platforms/dp/1633691721. Once you read it I will be glad to talk with you with this VIP link https://clarity.fm/mgalli/crack806-multisided but keep in mind I am not an expert, just a leaner too that can offer some little help.

Try an infographic but if budget/skillset doesn't allow use a word doc and create a pdf. Whatever you do keep it short and sweet and a better suggestion is to use the body of an email for the actual pitch and the attachment/one pager or close too with supplemental info. No one likes reading and this is just an opener so they get a feel - you can answer detailed questions in a call/meeting

I think that Eventbrite is your best solution. It's simple to use from an organizer and user perspective, and there's little fuss in taking payments. No reason to get fancier.