Please PLEASE let me help you here, ok? Don't do ANY summoning or fusing for the first day of the event, other than whatever you need for daily quests.
You will see if you have even the slightest chance after the first day. It's NOT a Sprint, it's a Marathon UNTIL the last few hours. Then it becomes a Sprint.. Your current plan is to do everything immediately and I promise you, if you do what you're planning you are gonna waste all your shards and silver and might not even get in the top 3.
You made this whole thread about how much you want Odin, I get how important he is to you ok?
DO NOT follow through on your plan. Take a screenshot of the standings tomorrow night and post it here and we can tell you if you should do your massive summoning. If it's only going to take you 2 hours to do, there's NO reason to do it on the first day.