Option 1 -> Simple future tense, but doesn't emphasize the continuous nature of the action during the specific time period.
Option 2 -> Present continuous tense used for planned future arrangements; indicates a scheduled event happening during that time.
Option 3 -> Future perfect tense suggests completion before a point in time, not an ongoing action during that period.
Option 4 -> Grammatically incorrect form (should be "will be attending" for future continuous).
Hence, Option 2: am attending -> The present continuous tense is commonly used in English to express planned future events, especially scheduled appointments or arrangements. Since the workshop is already planned and will be in progress "during that time," this is the most natural and appropriate choice. -> correct