Erivo is nominated for a best actress Bafta, and her co-star, US pop singer Ariana Grande is up for supporting actress for playing Glinda the good witch, an early friend to the green-skinned misunderstood witch.
Scottish actor and Doctor Who star Tennant arrived on the red carpet wearing a sparkly black suit before he hosts the ceremony for the second year running at the Royal Festival Hall in London on Sunday.
Among the celebrities who will present prizes are pop singer Camila Cabello, The Lord Of The Rings actor Orlando Bloom, Scottish actor James McAvoy and Pitch Perfect actress Anna Kendrick.
Jeff Goldblum and David Tennant are among the early arrivals at this year’s Bafta film awards.
Harry Potter star Warwick Davis will pick up the Bafta Fellowship, which is awarded to those “who have made an outstanding and exceptional contribution to film, games or television”.