1. opening

1. beginning, first, inaugural, initiative, initiatory, first, maiden, introductory, starting, gap
2. space, ceremony
3. ceremonial, ceremonial occasion, observance, change of integrity
4. opening night
5. curtain raising, start, motion
6. movement, move, motility, opportunity
7. chance, introduction
8. possibility
9. possible action, option, alternative, choice, orifice
10. porta, passage, passageway, artifact
11. artefact, hatchway
12. scuttle, entrance, entranceway, entryway, entry, entree, first step
12. initiative, opening move, beginning, start, commencement