Found this on the wikia page:
http://forgeofempires.wikia.com/wiki/2018_Forge_Bowl_Event
"Touchdown rewards are endless. You can win unlimited amounts of them, if you buy enough diamonds for that, of course. However, without diamonds you are guaranteed to win not more than 3 touchdown rewards. So you will get 2
Upgrades from them and a
Shrine of Knowledge. Together with 2
Upgrades you will get via quests, you can get your
Pillar of Heroes to the level 5. If you want to get it to the level 7, you will need to save your
footballs till the
Upgrade appears in the
Daily Specials. Please note that it may take you up to
2000 to get one daily special in the worst case. And you can only get
3525 through quests without spending diamonds on buying them."