We use the future continuous (will be + verb-ing), for an action which will be in progress at a stated future time. This time next week, I'll be skydiving.

Time expressions: this time next week/month, etc.

use the future perfect (will have + past participle), for an action that will be finished before another action at a stated future time. By the time he arrives, we will have finished our wood sculpting class.

Time expressions: before, by, by the time, until/till.

1 This time next Saturday, we shall be (canoeing) on the lake next to our house.

2 She will be (skiing) on the mountains this time next week.

3 He will not have finished his piano lesson by the time his parents come home.