This can be done through the following steps:
  1. Go to Control > Query.
  2. Click New Activities Query.
  3. From the left, choose "Activity Name".  Click Add.
  4. Choose "Is One Of" eNewsletter Subscription.  Click OK.
  5. Choose "Activity Date". Click Add. Choose Between [Select Date Range]. Click OK.
  6. Select Output Fields.  Run Query.