Add location and begin_time to talk and tutorial list's api

[lingin1230]

…and tutorialList's api

Types of changes

• [ ] Bugfix
• [x] New feature
• [ ] Refactoring
• [ ] Breaking change (any change that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Other (please describe)

Description

Add location and begin_time into events/talk, tutorial's api

Steps to Test This Pull Request

Please visit /api/events/speeches

Expected behavior

See if data with event_type talk or tutorial have location and begin_time

[codecov-commenter]

Codecov Report

Merging #1088 (eb71ea2) into master (1b594f5) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1088   +/-   ##
=======================================
  Coverage   69.49%   69.49%           
=======================================
  Files          82       82           
  Lines        3340     3340           
=======================================
  Hits         2321     2321           
  Misses       1019     1019           

Impacted Files	Coverage Δ
src/events/api/serializers.py	66.96% <100.00%> (ø)

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