In Amsterdam
You can choose to spend the night in Amsterdam. Downtown in the vibrant city centre or in one of the other neighbourhoods. The preference will be very personal! The Amsterdam area has over 450 hotels and hostels, so you will absolutely be able to find a convenient location that fits your wishes and budget. There is also a large number of apartments on airbnb. The website of the I Amsterdam Visitor Center (in English) is a good starting point for your search for a nice place to stay.
In Almere
You can also opt to stay in Almere, relatively close to the venue. There is a limited range of hotels, cottages and campsites. Here you will have a better price/quality ratio. For the budget traveler: a place on the brand new campsite Waterhout (10 km from the venue) is available from €15 for two persons per night (need to bring own tent).
A bicycle (for rent at almost every campsite or hotel, bicycle shop and tourist office) is an excellent way to travel to the venue.
Accommodation in Almere